1213955732 has 72 divisors (see below), whose sum is σ = 2454979968. Its totient is φ = 523842880.

The previous prime is 1213955719. The next prime is 1213955749. The reversal of 1213955732 is 2375593121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1858718 + ... + 1859370.

It is an arithmetic number, because the mean of its divisors is an integer number (34096944).

Almost surely, 2^1213955732 is an apocalyptic number.

It is an amenable number.

1213955732 is an abundant number, since it is smaller than the sum of its proper divisors (1241024236).

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

1213955732 is a wasteful number, since it uses less digits than its factorization.

1213955732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 856 counting only the distinct ones).

The product of its digits is 56700, while the sum is 38.

The square root of 1213955732 is about 34841.8675159642. The cubic root of 1213955732 is about 1066.7621959148.

The spelling of 1213955732 in words is "one billion, two hundred thirteen million, nine hundred fifty-five thousand, seven hundred thirty-two".