18937972 has 12 divisors (see below), whose sum is σ = 33608736. Its totient is φ = 9335480.

The previous prime is 18937951. The next prime is 18937973. The reversal of 18937972 is 27973981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18937973) 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 3 ways as a sum of consecutive naturals, for example, 33058 + ... + 33625.

It is an arithmetic number, because the mean of its divisors is an integer number (2800728).

Almost surely, 2^18937972 is an apocalyptic number.

It is an amenable number.

18937972 is a deficient number, since it is larger than the sum of its proper divisors (14670764).

18937972 is a wasteful number, since it uses less digits than its factorization.

18937972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66758 (or 66756 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 18937972 is about 4351.7780274274. The cubic root of 18937972 is about 266.5494700289.

The spelling of 18937972 in words is "eighteen million, nine hundred thirty-seven thousand, nine hundred seventy-two".