18253971 has 16 divisors (see below), whose sum is σ = 28634400. Its totient is φ = 11453184.

The previous prime is 18253957. The next prime is 18253993. The reversal of 18253971 is 17935281.

It is not a de Polignac number, because 18253971 - 2⁷ = 18253843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18253931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19426 + ... + 20343.

It is an arithmetic number, because the mean of its divisors is an integer number (1789650).

Almost surely, 2^18253971 is an apocalyptic number.

18253971 is a deficient number, since it is larger than the sum of its proper divisors (10380429).

18253971 is a wasteful number, since it uses less digits than its factorization.

18253971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39795 (or 39789 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 18253971 is about 4272.4666177748. The cubic root of 18253971 is about 263.3009657737.

The spelling of 18253971 in words is "eighteen million, two hundred fifty-three thousand, nine hundred seventy-one".