18361908 has 36 divisors (see below), whose sum is σ = 46590180. Its totient is φ = 6097536.

The previous prime is 18361897. The next prime is 18361957. The reversal of 18361908 is 80916381.

It can be written as a sum of positive squares in 2 ways, for example, as 9998244 + 8363664 = 3162^2 + 2892^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10608 + ... + 12216.

Almost surely, 2^18361908 is an apocalyptic number.

18361908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18361908 is an abundant number, since it is smaller than the sum of its proper divisors (28228272).

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

18361908 is a wasteful number, since it uses less digits than its factorization.

18361908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18361908 is about 4285.0796958750. The cubic root of 18361908 is about 263.8189185217.

The spelling of 18361908 in words is "eighteen million, three hundred sixty-one thousand, nine hundred eight".