18613040 has 20 divisors (see below), whose sum is σ = 43275504. Its totient is φ = 7445184.

The previous prime is 18613037. The next prime is 18613061. The reversal of 18613040 is 4031681.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18612997 and 18613015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116252 + ... + 116411.

Almost surely, 2^18613040 is an apocalyptic number.

18613040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18613040 is an abundant number, since it is smaller than the sum of its proper divisors (24662464).

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

18613040 is a wasteful number, since it uses less digits than its factorization.

18613040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232676 (or 232670 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18613040 is about 4314.2832544931. The cubic root of 18613040 is about 265.0162088104.

The spelling of 18613040 in words is "eighteen million, six hundred thirteen thousand, forty".