18498940 has 24 divisors (see below), whose sum is σ = 40102272. Its totient is φ = 7160640.

The previous prime is 18498937. The next prime is 18498943. The reversal of 18498940 is 4989481.

It is an interprime number because it is at equal distance from previous prime (18498937) and next prime (18498943).

It is a super-2 number, since 2×18498940² = 684421562247200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18498943) 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, 14299 + ... + 15538.

It is an arithmetic number, because the mean of its divisors is an integer number (1670928).

Almost surely, 2^18498940 is an apocalyptic number.

18498940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18498940 is an abundant number, since it is smaller than the sum of its proper divisors (21603332).

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

18498940 is a wasteful number, since it uses less digits than its factorization.

18498940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29877 (or 29875 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18498940 is about 4301.0394092591. The cubic root of 18498940 is about 264.4735722348.

The spelling of 18498940 in words is "eighteen million, four hundred ninety-eight thousand, nine hundred forty".