1097312388 has 12 divisors (see below), whose sum is σ = 2560395600. Its totient is φ = 365770792.

The previous prime is 1097312387. The next prime is 1097312401. The reversal of 1097312388 is 8832137901.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1097312383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45721338 + ... + 45721361.

It is an arithmetic number, because the mean of its divisors is an integer number (213366300).

Almost surely, 2^1097312388 is an apocalyptic number.

It is an amenable number.

1097312388 is an abundant number, since it is smaller than the sum of its proper divisors (1463083212).

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

1097312388 is a wasteful number, since it uses less digits than its factorization.

1097312388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91442706 (or 91442704 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1097312388 is about 33125.7058490834. The cubic root of 1097312388 is about 1031.4387121168.

The spelling of 1097312388 in words is "one billion, ninety-seven million, three hundred twelve thousand, three hundred eighty-eight".