1230872391 has 24 divisors (see below), whose sum is σ = 2097465344. Its totient is φ = 680665680.

The previous prime is 1230872387. The next prime is 1230872431. The reversal of 1230872391 is 1932780321.

It is not a de Polignac number, because 1230872391 - 2² = 1230872387 is a prime.

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 Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230872311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313171 + ... + 317076.

Almost surely, 2^1230872391 is an apocalyptic number.

1230872391 is a deficient number, since it is larger than the sum of its proper divisors (866592953).

1230872391 is a wasteful number, since it uses less digits than its factorization.

1230872391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630291 (or 630288 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1230872391 is about 35083.7910009737. The cubic root of 1230872391 is about 1071.6945203200.

The spelling of 1230872391 in words is "one billion, two hundred thirty million, eight hundred seventy-two thousand, three hundred ninety-one".