18474457 has 2 divisors, whose sum is σ = 18474458. Its totient is φ = 18474456.

The previous prime is 18474439. The next prime is 18474487. The reversal of 18474457 is 75447481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 121801 = 4284^2 + 349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18474457 is a prime.

It is a super-2 number, since 2×18474457² = 682611122889698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18474487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237228 + 9237229.

It is an arithmetic number, because the mean of its divisors is an integer number (9237229).

Almost surely, 2^18474457 is an apocalyptic number.

It is an amenable number.

18474457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474457 is an equidigital number, since it uses as much as digits as its factorization.

18474457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 18474457 is about 4298.1922944419. The cubic root of 18474457 is about 264.3568454542.

The spelling of 18474457 in words is "eighteen million, four hundred seventy-four thousand, four hundred fifty-seven".