18630401 has 4 divisors (see below), whose sum is σ = 18981972. Its totient is φ = 18278832.

The previous prime is 18630397. The next prime is 18630449. The reversal of 18630401 is 10403681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8549776 + 10080625 = 2924^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 18630401 - 2² = 18630397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18630301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175706 + ... + 175811.

It is an arithmetic number, because the mean of its divisors is an integer number (4745493).

Almost surely, 2^18630401 is an apocalyptic number.

It is an amenable number.

18630401 is a deficient number, since it is larger than the sum of its proper divisors (351571).

18630401 is an equidigital number, since it uses as much as digits as its factorization.

18630401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351570.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18630401 is about 4316.2948231093. The cubic root of 18630401 is about 265.0985796761.

The spelling of 18630401 in words is "eighteen million, six hundred thirty thousand, four hundred one".