18499491 has 12 divisors (see below), whose sum is σ = 27226368. Its totient is φ = 12099984.

The previous prime is 18499489. The next prime is 18499493. The reversal of 18499491 is 19499481.

It is an interprime number because it is at equal distance from previous prime (18499489) and next prime (18499493).

It is not a de Polignac number, because 18499491 - 2¹ = 18499489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18499493) 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, 18915 + ... + 19868.

It is an arithmetic number, because the mean of its divisors is an integer number (2268864).

Almost surely, 2^18499491 is an apocalyptic number.

18499491 is a deficient number, since it is larger than the sum of its proper divisors (8726877).

18499491 is a wasteful number, since it uses less digits than its factorization.

18499491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38842 (or 38839 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18499491 is about 4301.1034630662. The cubic root of 18499491 is about 264.4761980337.

The spelling of 18499491 in words is "eighteen million, four hundred ninety-nine thousand, four hundred ninety-one".