18921896 has 16 divisors (see below), whose sum is σ = 40547040. Its totient is φ = 8109360.

The previous prime is 18921863. The next prime is 18921899. The reversal of 18921896 is 69812981.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18921899) 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, 168890 + ... + 169001.

It is an arithmetic number, because the mean of its divisors is an integer number (2534190).

Almost surely, 2^18921896 is an apocalyptic number.

It is an amenable number.

18921896 is an abundant number, since it is smaller than the sum of its proper divisors (21625144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18921896 is a wasteful number, since it uses less digits than its factorization.

18921896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337904 (or 337900 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 18921896 is about 4349.9305741586. The cubic root of 18921896 is about 266.4740261474.

The spelling of 18921896 in words is "eighteen million, nine hundred twenty-one thousand, eight hundred ninety-six".