18139057 has 4 divisors (see below), whose sum is σ = 18196596. Its totient is φ = 18081520.

The previous prime is 18139031. The next prime is 18139073. The reversal of 18139057 is 75093181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 7667361 = 3236^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 18139057 - 2¹⁵ = 18106289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139027) 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, 28294 + ... + 28927.

It is an arithmetic number, because the mean of its divisors is an integer number (4549149).

Almost surely, 2^18139057 is an apocalyptic number.

It is an amenable number.

18139057 is a deficient number, since it is larger than the sum of its proper divisors (57539).

18139057 is an equidigital number, since it uses as much as digits as its factorization.

18139057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57538.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18139057 is about 4258.9971824363. The cubic root of 18139057 is about 262.7472838328.

The spelling of 18139057 in words is "eighteen million, one hundred thirty-nine thousand, fifty-seven".