18961856 has 14 divisors (see below), whose sum is σ = 37627560. Its totient is φ = 9480896.

The previous prime is 18961847. The next prime is 18961879. The reversal of 18961856 is 65816981.

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

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, 148076 + ... + 148203.

Almost surely, 2^18961856 is an apocalyptic number.

18961856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18961856 is a deficient number, since it is larger than the sum of its proper divisors (18665704).

18961856 is an equidigital number, since it uses as much as digits as its factorization.

18961856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296291 (or 296281 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 18961856 is about 4354.5213284585. The cubic root of 18961856 is about 266.6614776768.

The spelling of 18961856 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred fifty-six".