18072140 has 12 divisors (see below), whose sum is σ = 37951536. Its totient is φ = 7228848.

The previous prime is 18072079. The next prime is 18072149. The reversal of 18072140 is 4127081.

It is not an unprimeable number, because it can be changed into a prime (18072149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451784 + ... + 451823.

It is an arithmetic number, because the mean of its divisors is an integer number (3162628).

Almost surely, 2^18072140 is an apocalyptic number.

18072140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18072140 is an abundant number, since it is smaller than the sum of its proper divisors (19879396).

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

18072140 is a wasteful number, since it uses less digits than its factorization.

18072140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903616 (or 903614 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 18072140 is about 4251.1339663671. The cubic root of 18072140 is about 262.4237843737.

The spelling of 18072140 in words is "eighteen million, seventy-two thousand, one hundred forty".