18958199 has 8 divisors (see below), whose sum is σ = 21120960. Its totient is φ = 16896096.

The previous prime is 18958193. The next prime is 18958217. The reversal of 18958199 is 99185981.

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

It is not a de Polignac number, because 18958199 - 2⁸ = 18957943 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 (18958193) 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, 24767 + ... + 25520.

It is an arithmetic number, because the mean of its divisors is an integer number (2640120).

Almost surely, 2^18958199 is an apocalyptic number.

18958199 is a deficient number, since it is larger than the sum of its proper divisors (2162761).

18958199 is a wasteful number, since it uses less digits than its factorization.

18958199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50329.

The product of its digits is 233280, while the sum is 50.

The square root of 18958199 is about 4354.1013998298. The cubic root of 18958199 is about 266.6443337200.

The spelling of 18958199 in words is "eighteen million, nine hundred fifty-eight thousand, one hundred ninety-nine".