18413748 has 36 divisors (see below), whose sum is σ = 46677540. Its totient is φ = 6120576.

The previous prime is 18413743. The next prime is 18413749. The reversal of 18413748 is 84731481.

It can be written as a sum of positive squares in 2 ways, for example, as 4485924 + 13927824 = 2118^2 + 3732^2 .

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

It is a super-2 number, since 2×18413748² = 678132230815008, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18413741) 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, 21798 + ... + 22626.

Almost surely, 2^18413748 is an apocalyptic number.

18413748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18413748 is an abundant number, since it is smaller than the sum of its proper divisors (28263792).

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

18413748 is a wasteful number, since it uses less digits than its factorization.

18413748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1451 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18413748 is about 4291.1243281919. The cubic root of 18413748 is about 264.0669595993.

The spelling of 18413748 in words is "eighteen million, four hundred thirteen thousand, seven hundred forty-eight".