18978462 has 40 divisors (see below), whose sum is σ = 42816576. Its totient is φ = 6283008.

The previous prime is 18978461. The next prime is 18978469. The reversal of 18978462 is 26487981.

18978462 is a `hidden beast` number, since 189 + 7 + 8 + 462 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978461) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30963 + ... + 31569.

Almost surely, 2^18978462 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18978462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21408288).

18978462 is an abundant number, since it is smaller than the sum of its proper divisors (23838114).

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

18978462 is a wasteful number, since it uses less digits than its factorization.

18978462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 805 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 18978462 is about 4356.4276649567. The cubic root of 18978462 is about 266.7392986182.

The spelling of 18978462 in words is "eighteen million, nine hundred seventy-eight thousand, four hundred sixty-two".