18906040 has 32 divisors (see below), whose sum is σ = 45042480. Its totient is φ = 7117312.

The previous prime is 18906031. The next prime is 18906049. The reversal of 18906040 is 4060981.

It is an interprime number because it is at equal distance from previous prime (18906031) and next prime (18906049).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18906049) 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, 13222 + ... + 14581.

Almost surely, 2^18906040 is an apocalyptic number.

18906040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18906040 is an abundant number, since it is smaller than the sum of its proper divisors (26136440).

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

18906040 is a wasteful number, since it uses less digits than its factorization.

18906040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27831 (or 27827 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18906040 is about 4348.1076343623. The cubic root of 18906040 is about 266.3995728454.

The spelling of 18906040 in words is "eighteen million, nine hundred six thousand, forty".