18449040 has 40 divisors (see below), whose sum is σ = 57192768. Its totient is φ = 4919680.

The previous prime is 18449027. The next prime is 18449069. The reversal of 18449040 is 4094481.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18448989 and 18449007.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38196 + ... + 38675.

Almost surely, 2^18449040 is an apocalyptic number.

18449040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18449040 is an abundant number, since it is smaller than the sum of its proper divisors (38743728).

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

18449040 is a wasteful number, since it uses less digits than its factorization.

18449040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76887 (or 76881 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18449040 is about 4295.2345686819. The cubic root of 18449040 is about 264.2355565184.

The spelling of 18449040 in words is "eighteen million, four hundred forty-nine thousand, forty".