11972431 has 4 divisors (see below), whose sum is σ = 12151192. Its totient is φ = 11793672.

The previous prime is 11972407. The next prime is 11972459. The reversal of 11972431 is 13427911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11972431 is a prime.

It is a super-2 number, since 2×11972431² = 286678208099522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11972431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11972461) 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, 89280 + ... + 89413.

It is an arithmetic number, because the mean of its divisors is an integer number (3037798).

Almost surely, 2^11972431 is an apocalyptic number.

11972431 is a deficient number, since it is larger than the sum of its proper divisors (178761).

11972431 is an equidigital number, since it uses as much as digits as its factorization.

11972431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178760.

The product of its digits is 1512, while the sum is 28.

The square root of 11972431 is about 3460.1200846213. The cubic root of 11972431 is about 228.7673883683.

It can be divided in two parts, 11972 and 431, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 11972431 in words is "eleven million, nine hundred seventy-two thousand, four hundred thirty-one".