18950401 has 12 divisors (see below), whose sum is σ = 19997652. Its totient is φ = 17944416.

The previous prime is 18950389. The next prime is 18950431. The reversal of 18950401 is 10405981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10400625 + 8549776 = 3225^2 + 2924^2 .

It is not a de Polignac number, because 18950401 - 2⁷ = 18950273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18950401.

It is not an unprimeable number, because it can be changed into a prime (18950431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68275 + ... + 68551.

It is an arithmetic number, because the mean of its divisors is an integer number (1666471).

Almost surely, 2^18950401 is an apocalyptic number.

It is an amenable number.

18950401 is a deficient number, since it is larger than the sum of its proper divisors (1047251).

18950401 is an equidigital number, since it uses as much as digits as its factorization.

18950401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18950401 is about 4353.2058301900. The cubic root of 18950401 is about 266.6077694579.

The spelling of 18950401 in words is "eighteen million, nine hundred fifty thousand, four hundred one".