18956953 has 4 divisors (see below), whose sum is σ = 19130980. Its totient is φ = 18782928.

The previous prime is 18956897. The next prime is 18956963. The reversal of 18956953 is 35965981.

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 10679824 + 8277129 = 3268^2 + 2877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18956953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18956963) 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, 86850 + ... + 87067.

It is an arithmetic number, because the mean of its divisors is an integer number (4782745).

Almost surely, 2^18956953 is an apocalyptic number.

It is an amenable number.

18956953 is a deficient number, since it is larger than the sum of its proper divisors (174027).

18956953 is a wasteful number, since it uses less digits than its factorization.

18956953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174026.

The product of its digits is 291600, while the sum is 46.

The square root of 18956953 is about 4353.9583139943. The cubic root of 18956953 is about 266.6384919886.

Subtracting 18956953 from its reverse (35965981), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 18956953 in words is "eighteen million, nine hundred fifty-six thousand, nine hundred fifty-three".