18964431 has 12 divisors (see below), whose sum is σ = 27462240. Its totient is φ = 12611040.

The previous prime is 18964423. The next prime is 18964457. The reversal of 18964431 is 13446981.

18964431 is a `hidden beast` number, since 1 + 8 + 9 + 644 + 3 + 1 = 666.

It is not a de Polignac number, because 18964431 - 2³ = 18964423 is a prime.

It is a super-2 number, since 2×18964431² = 719299286307522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18964471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1435 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (2288520).

Almost surely, 2^18964431 is an apocalyptic number.

18964431 is a deficient number, since it is larger than the sum of its proper divisors (8497809).

18964431 is a wasteful number, since it uses less digits than its factorization.

18964431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5326 (or 5323 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18964431 is about 4354.8169881179. The cubic root of 18964431 is about 266.6735479127.

It can be divided in two parts, 189 and 64431, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 18964431 in words is "eighteen million, nine hundred sixty-four thousand, four hundred thirty-one".