18964438 has 4 divisors (see below), whose sum is σ = 28446660. Its totient is φ = 9482218.

The previous prime is 18964423. The next prime is 18964457. The reversal of 18964438 is 83446981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18964394 and 18964403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4741108 + ... + 4741111.

It is an arithmetic number, because the mean of its divisors is an integer number (7111665).

Almost surely, 2^18964438 is an apocalyptic number.

18964438 is a deficient number, since it is larger than the sum of its proper divisors (9482222).

18964438 is an equidigital number, since it uses as much as digits as its factorization.

18964438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482221.

The product of its digits is 165888, while the sum is 43.

The square root of 18964438 is about 4354.8177918255. The cubic root of 18964438 is about 266.6735807235.

The spelling of 18964438 in words is "eighteen million, nine hundred sixty-four thousand, four hundred thirty-eight".