18937140 has 48 divisors (see below), whose sum is σ = 53212992. Its totient is φ = 5031936.

The previous prime is 18937117. The next prime is 18937141. The reversal of 18937140 is 4173981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18937141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32532 + ... + 33108.

It is an arithmetic number, because the mean of its divisors is an integer number (1108604).

Almost surely, 2^18937140 is an apocalyptic number.

18937140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18937140 is an abundant number, since it is smaller than the sum of its proper divisors (34275852).

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

18937140 is a wasteful number, since it uses less digits than its factorization.

18937140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 18937140 is about 4351.6824332665. The cubic root of 18937140 is about 266.5455665415.

The spelling of 18937140 in words is "eighteen million, nine hundred thirty-seven thousand, one hundred forty".