18950399 has 8 divisors (see below), whose sum is σ = 20443920. Its totient is φ = 17462016.

The previous prime is 18950389. The next prime is 18950431. The reversal of 18950399 is 99305981.

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

It is not a de Polignac number, because 18950399 - 2²⁰ = 17901823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18950339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10319 + ... + 12015.

It is an arithmetic number, because the mean of its divisors is an integer number (2555490).

Almost surely, 2^18950399 is an apocalyptic number.

18950399 is a deficient number, since it is larger than the sum of its proper divisors (1493521).

18950399 is a wasteful number, since it uses less digits than its factorization.

18950399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 18950399 is about 4353.2056004742. The cubic root of 18950399 is about 266.6077600788.

The spelling of 18950399 in words is "eighteen million, nine hundred fifty thousand, three hundred ninety-nine".