1209145752 has 32 divisors (see below), whose sum is σ = 3358738800. Its totient is φ = 403048512.

The previous prime is 1209145741. The next prime is 1209145753. The reversal of 1209145752 is 2575419021.

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 (1209145753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798733 + ... + 2799164.

Almost surely, 2^1209145752 is an apocalyptic number.

1209145752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1209145752 is an abundant number, since it is smaller than the sum of its proper divisors (2149593048).

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

1209145752 is a wasteful number, since it uses less digits than its factorization.

1209145752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597912 (or 5597902 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 1209145752 is about 34772.7731422157. The cubic root of 1209145752 is about 1065.3514095264.

The spelling of 1209145752 in words is "one billion, two hundred nine million, one hundred forty-five thousand, seven hundred fifty-two".