18434540 has 24 divisors (see below), whose sum is σ = 38793552. Its totient is φ = 7358400.

The previous prime is 18434531. The next prime is 18434551. The reversal of 18434540 is 4543481.

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, 17015 + ... + 18065.

It is an arithmetic number, because the mean of its divisors is an integer number (1616398).

Almost surely, 2^18434540 is an apocalyptic number.

18434540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18434540 is an abundant number, since it is smaller than the sum of its proper divisors (20359012).

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

18434540 is a wasteful number, since it uses less digits than its factorization.

18434540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1935 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 18434540 is about 4293.5463197688. The cubic root of 18434540 is about 264.1663131726.

The spelling of 18434540 in words is "eighteen million, four hundred thirty-four thousand, five hundred forty".