18978896 has 10 divisors (see below), whose sum is σ = 36771642. Its totient is φ = 9489440.

The previous prime is 18978893. The next prime is 18978901. The reversal of 18978896 is 69887981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 2689600 = 4036^2 + 1640^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593075 + ... + 593106.

Almost surely, 2^18978896 is an apocalyptic number.

18978896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18978896 is a deficient number, since it is larger than the sum of its proper divisors (17792746).

18978896 is a wasteful number, since it uses less digits than its factorization.

18978896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186189 (or 1186183 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 56.

The square root of 18978896 is about 4356.4774761268. The cubic root of 18978896 is about 266.7413318700.

The spelling of 18978896 in words is "eighteen million, nine hundred seventy-eight thousand, eight hundred ninety-six".