18232457 has 4 divisors (see below), whose sum is σ = 19192080. Its totient is φ = 17272836.

The previous prime is 18232447. The next prime is 18232463. The reversal of 18232457 is 75423281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75423281 = 409 ⋅184409.

It is a cyclic number.

It is not a de Polignac number, because 18232457 - 2⁴ = 18232441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18232427) 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, 479783 + ... + 479820.

It is an arithmetic number, because the mean of its divisors is an integer number (4798020).

Almost surely, 2^18232457 is an apocalyptic number.

It is an amenable number.

18232457 is a deficient number, since it is larger than the sum of its proper divisors (959623).

18232457 is an equidigital number, since it uses as much as digits as its factorization.

18232457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959622.

The product of its digits is 13440, while the sum is 32.

The square root of 18232457 is about 4269.9481261486. The cubic root of 18232457 is about 263.1974835620.

The spelling of 18232457 in words is "eighteen million, two hundred thirty-two thousand, four hundred fifty-seven".