18374431 has 2 divisors, whose sum is σ = 18374432. Its totient is φ = 18374430.

The previous prime is 18374417. The next prime is 18374441. The reversal of 18374431 is 13447381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18374431 - 2⁹ = 18373919 is a prime.

It is a super-2 number, since 2×18374431² = 675239429147522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18374393 and 18374402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18374441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9187215 + 9187216.

It is an arithmetic number, because the mean of its divisors is an integer number (9187216).

Almost surely, 2^18374431 is an apocalyptic number.

18374431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18374431 is an equidigital number, since it uses as much as digits as its factorization.

18374431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 18374431 is about 4286.5406798490. The cubic root of 18374431 is about 263.8788805824.

The spelling of 18374431 in words is "eighteen million, three hundred seventy-four thousand, four hundred thirty-one".