18572039 has 4 divisors (see below), whose sum is σ = 19074024. Its totient is φ = 18070056.

The previous prime is 18572011. The next prime is 18572077. The reversal of 18572039 is 93027581.

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

It is a cyclic number.

It is not a de Polignac number, because 18572039 - 2¹² = 18567943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18572089) 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, 250937 + ... + 251010.

It is an arithmetic number, because the mean of its divisors is an integer number (4768506).

Almost surely, 2^18572039 is an apocalyptic number.

18572039 is a deficient number, since it is larger than the sum of its proper divisors (501985).

18572039 is an equidigital number, since it uses as much as digits as its factorization.

18572039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501984.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 18572039 is about 4309.5288605600. The cubic root of 18572039 is about 264.8214722550.

The spelling of 18572039 in words is "eighteen million, five hundred seventy-two thousand, thirty-nine".