18774401 has 2 divisors, whose sum is σ = 18774402. Its totient is φ = 18774400.

The previous prime is 18774391. The next prime is 18774407. The reversal of 18774401 is 10447781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 4906225 = 3724^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18774401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18774407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9387200 + 9387201.

It is an arithmetic number, because the mean of its divisors is an integer number (9387201).

Almost surely, 2^18774401 is an apocalyptic number.

It is an amenable number.

18774401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18774401 is an equidigital number, since it uses as much as digits as its factorization.

18774401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 18774401 is about 4332.9436876101. The cubic root of 18774401 is about 265.7798364805.

The spelling of 18774401 in words is "eighteen million, seven hundred seventy-four thousand, four hundred one".