18138752 has 16 divisors (see below), whose sum is σ = 36136050. Its totient is φ = 9069312.

The previous prime is 18138739. The next prime is 18138767. The reversal of 18138752 is 25783181.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 1032256 = 4136^2 + 1016^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70727 + ... + 70982.

Almost surely, 2^18138752 is an apocalyptic number.

It is an amenable number.

18138752 is a deficient number, since it is larger than the sum of its proper divisors (17997298).

18138752 is an equidigital number, since it uses as much as digits as its factorization.

18138752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141723 (or 141711 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 18138752 is about 4258.9613757347. The cubic root of 18138752 is about 262.7458111658.

The spelling of 18138752 in words is "eighteen million, one hundred thirty-eight thousand, seven hundred fifty-two".