18900681 has 8 divisors (see below), whose sum is σ = 25248384. Its totient is φ = 12576720.

The previous prime is 18900653. The next prime is 18900691. The reversal of 18900681 is 18600981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18900681 - 2⁹ = 18900169 is a prime.

It is a super-2 number, since 2×18900681² = 714471484527522, which contains 22 as substring.

18900681 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18900691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3985 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (3156048).

Almost surely, 2^18900681 is an apocalyptic number.

It is an amenable number.

18900681 is a deficient number, since it is larger than the sum of its proper divisors (6347703).

18900681 is a wasteful number, since it uses less digits than its factorization.

18900681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11871.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 18900681 is about 4347.4913455923. The cubic root of 18900681 is about 266.3743997575.

The spelling of 18900681 in words is "eighteen million, nine hundred thousand, six hundred eighty-one".