18946401 has 8 divisors (see below), whose sum is σ = 26591520. Its totient is φ = 11966112.

The previous prime is 18946397. The next prime is 18946427. The reversal of 18946401 is 10464981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18946401 - 2² = 18946397 is a prime.

It is a super-2 number, since 2×18946401² = 717932221705602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18946451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166140 + ... + 166253.

It is an arithmetic number, because the mean of its divisors is an integer number (3323940).

Almost surely, 2^18946401 is an apocalyptic number.

It is an amenable number.

18946401 is a deficient number, since it is larger than the sum of its proper divisors (7645119).

18946401 is a wasteful number, since it uses less digits than its factorization.

18946401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332415.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18946401 is about 4352.7463744170. The cubic root of 18946401 is about 266.5890098528.

The spelling of 18946401 in words is "eighteen million, nine hundred forty-six thousand, four hundred one".