1209445272 has 96 divisors (see below), whose sum is σ = 3750439680. Its totient is φ = 344917440.

The previous prime is 1209445217. The next prime is 1209445277. The reversal of 1209445272 is 2725449021.

1209445272 is a `hidden beast` number, since 1 + 209 + 445 + 2 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209445277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 316123 + ... + 319925.

It is an arithmetic number, because the mean of its divisors is an integer number (39067080).

Almost surely, 2^1209445272 is an apocalyptic number.

1209445272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209445272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875219840).

1209445272 is an abundant number, since it is smaller than the sum of its proper divisors (2540994408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209445272 is a wasteful number, since it uses less digits than its factorization.

1209445272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453 (or 4446 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1209445272 is about 34777.0796933843. The cubic root of 1209445272 is about 1065.4393690658.

The spelling of 1209445272 in words is "one billion, two hundred nine million, four hundred forty-five thousand, two hundred seventy-two".