18950409 has 16 divisors (see below), whose sum is σ = 28194240. Its totient is φ = 12579840.

The previous prime is 18950389. The next prime is 18950431. The reversal of 18950409 is 90405981.

18950409 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 18950409 - 2⁵ = 18950377 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18950479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5574 + ... + 8304.

It is an arithmetic number, because the mean of its divisors is an integer number (1762140).

Almost surely, 2^18950409 is an apocalyptic number.

It is an amenable number.

18950409 is a deficient number, since it is larger than the sum of its proper divisors (9243831).

18950409 is a wasteful number, since it uses less digits than its factorization.

18950409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997 (or 2991 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18950409 is about 4353.2067490529. The cubic root of 18950409 is about 266.6078069745.

The spelling of 18950409 in words is "eighteen million, nine hundred fifty thousand, four hundred nine".