18716401 has 6 divisors (see below), whose sum is σ = 20572706. Its totient is φ = 17014800.

The previous prime is 18716359. The next prime is 18716407. The reversal of 18716401 is 10461781.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 874225 = 4224^2 + 935^2 .

It is not a de Polignac number, because 18716401 - 2⁹ = 18715889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18716401.

It is not an unprimeable number, because it can be changed into a prime (18716407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77220 + ... + 77461.

Almost surely, 2^18716401 is an apocalyptic number.

18716401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18716401 is a deficient number, since it is larger than the sum of its proper divisors (1856305).

18716401 is a wasteful number, since it uses less digits than its factorization.

18716401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154703 (or 154692 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18716401 is about 4326.2456009801. The cubic root of 18716401 is about 265.5058617924.

The spelling of 18716401 in words is "eighteen million, seven hundred sixteen thousand, four hundred one".