18499690 has 24 divisors (see below), whose sum is σ = 36604260. Its totient is φ = 6726720.

The previous prime is 18499661. The next prime is 18499693. The reversal of 18499690 is 9699481.

It can be written as a sum of positive squares in 2 ways, for example, as 18498601 + 1089 = 4301^2 + 33^2 .

It is a super-2 number, since 2×18499690² = 684477060192200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18499690.

It is not an unprimeable number, because it can be changed into a prime (18499693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6435 + ... + 8854.

Almost surely, 2^18499690 is an apocalyptic number.

18499690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18499690 is a deficient number, since it is larger than the sum of its proper divisors (18104570).

18499690 is a wasteful number, since it uses less digits than its factorization.

18499690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15318 (or 15307 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 18499690 is about 4301.1265966023. The cubic root of 18499690 is about 264.4771463585.

The spelling of 18499690 in words is "eighteen million, four hundred ninety-nine thousand, six hundred ninety".