18639053 has 4 divisors (see below), whose sum is σ = 18706620. Its totient is φ = 18571488.

The previous prime is 18639013. The next prime is 18639059. The reversal of 18639053 is 35093681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35093681 = 7 ⋅5013383.

It can be written as a sum of positive squares in 2 ways, for example, as 2301289 + 16337764 = 1517^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 18639053 - 2⁶ = 18638989 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 (18639059) 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, 33368 + ... + 33921.

It is an arithmetic number, because the mean of its divisors is an integer number (4676655).

Almost surely, 2^18639053 is an apocalyptic number.

It is an amenable number.

18639053 is a deficient number, since it is larger than the sum of its proper divisors (67567).

18639053 is an equidigital number, since it uses as much as digits as its factorization.

18639053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67566.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 18639053 is about 4317.2969552719. The cubic root of 18639053 is about 265.1396107834.

The spelling of 18639053 in words is "eighteen million, six hundred thirty-nine thousand, fifty-three".