18908961 has 8 divisors (see below), whose sum is σ = 25893504. Its totient is φ = 12265200.

The previous prime is 18908959. The next prime is 18908983. The reversal of 18908961 is 16980981.

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

It is not a de Polignac number, because 18908961 - 2¹ = 18908959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18908951) 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, 85065 + ... + 85286.

It is an arithmetic number, because the mean of its divisors is an integer number (3236688).

Almost surely, 2^18908961 is an apocalyptic number.

It is an amenable number.

18908961 is a deficient number, since it is larger than the sum of its proper divisors (6984543).

18908961 is a wasteful number, since it uses less digits than its factorization.

18908961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170391.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18908961 is about 4348.4435146383. The cubic root of 18908961 is about 266.4132917959.

The spelling of 18908961 in words is "eighteen million, nine hundred eight thousand, nine hundred sixty-one".