18449900 has 36 divisors (see below), whose sum is σ = 45757488. Its totient is φ = 6325440.

The previous prime is 18449891. The next prime is 18449911. The reversal of 18449900 is 994481.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 12479 + ... + 13878.

Almost surely, 2^18449900 is an apocalyptic number.

18449900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18449900 is an abundant number, since it is smaller than the sum of its proper divisors (27307588).

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

18449900 is a wasteful number, since it uses less digits than its factorization.

18449900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26378 (or 26371 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18449900 is about 4295.3346784622. The cubic root of 18449900 is about 264.2396622252.

The spelling of 18449900 in words is "eighteen million, four hundred forty-nine thousand, nine hundred".