18879091 has 8 divisors (see below), whose sum is σ = 23537664. Its totient is φ = 14710920.

The previous prime is 18879089. The next prime is 18879109. The reversal of 18879091 is 19097881.

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

It is not a de Polignac number, because 18879091 - 2¹ = 18879089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18879001) 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, 122515 + ... + 122668.

It is an arithmetic number, because the mean of its divisors is an integer number (2942208).

Almost surely, 2^18879091 is an apocalyptic number.

18879091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18879091 is a deficient number, since it is larger than the sum of its proper divisors (4658573).

18879091 is a wasteful number, since it uses less digits than its factorization.

18879091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245201.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18879091 is about 4345.0075949301. The cubic root of 18879091 is about 266.2729357864.

It can be divided in two parts, 188790 and 91, that added together give a palindrome (188881).

The spelling of 18879091 in words is "eighteen million, eight hundred seventy-nine thousand, ninety-one".