18969856 has 18 divisors (see below), whose sum is σ = 37866122. Its totient is φ = 9484800.

The previous prime is 18969817. The next prime is 18969869. The reversal of 18969856 is 65896981.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 3097600 = 3984^2 + 1760^2 .

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, 36795 + ... + 37306.

Almost surely, 2^18969856 is an apocalyptic number.

18969856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18969856 is a deficient number, since it is larger than the sum of its proper divisors (18896266).

18969856 is an frugal number, since it uses more digits than its factorization.

18969856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74117 (or 74103 counting only the distinct ones).

The product of its digits is 933120, while the sum is 52.

The square root of 18969856 is about 4355.4398170564. The cubic root of 18969856 is about 266.6989738635.

The spelling of 18969856 in words is "eighteen million, nine hundred sixty-nine thousand, eight hundred fifty-six".