1209449472 has 176 divisors, whose sum is σ = 4019849472. Its totient is φ = 314081280.

The previous prime is 1209449467. The next prime is 1209449477. The reversal of 1209449472 is 2749449021.

It is an interprime number because it is at equal distance from previous prime (1209449467) and next prime (1209449477).

It is a tau number, because it is divible by the number of its divisors (176).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209449477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233988 + ... + 239100.

Almost surely, 2^1209449472 is an apocalyptic number.

1209449472 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 1209449472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2009924736).

1209449472 is an abundant number, since it is smaller than the sum of its proper divisors (2810400000).

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

1209449472 is a wasteful number, since it uses less digits than its factorization.

1209449472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154 (or 5136 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 1209449472 is about 34777.1400779305. The cubic root of 1209449472 is about 1065.4406023695.

The spelling of 1209449472 in words is "one billion, two hundred nine million, four hundred forty-nine thousand, four hundred seventy-two".