18696431 has 8 divisors (see below), whose sum is σ = 20324304. Its totient is φ = 17095680.

The previous prime is 18696427. The next prime is 18696463. The reversal of 18696431 is 13469681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18696431 - 2² = 18696427 is a prime.

It is a super-2 number, since 2×18696431² = 699113064275522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18696421) 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, 5330 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (2540538).

Almost surely, 2^18696431 is an apocalyptic number.

18696431 is a deficient number, since it is larger than the sum of its proper divisors (1627873).

18696431 is a wasteful number, since it uses less digits than its factorization.

18696431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13561.

The product of its digits is 31104, while the sum is 38.

The square root of 18696431 is about 4323.9369791892. The cubic root of 18696431 is about 265.4113984936.

The spelling of 18696431 in words is "eighteen million, six hundred ninety-six thousand, four hundred thirty-one".