18894401 has 2 divisors, whose sum is σ = 18894402. Its totient is φ = 18894400.

The previous prime is 18894397. The next prime is 18894413. The reversal of 18894401 is 10449881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 15376 = 4345^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 18894401 - 2² = 18894397 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18894461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447200 + 9447201.

It is an arithmetic number, because the mean of its divisors is an integer number (9447201).

Almost surely, 2^18894401 is an apocalyptic number.

It is an amenable number.

18894401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894401 is an equidigital number, since it uses as much as digits as its factorization.

18894401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18894401 is about 4346.7690299808. The cubic root of 18894401 is about 266.3448943561.

The spelling of 18894401 in words is "eighteen million, eight hundred ninety-four thousand, four hundred one".