18879901 has 4 divisors (see below), whose sum is σ = 19873600. Its totient is φ = 17886204.

The previous prime is 18879893. The next prime is 18879907. The reversal of 18879901 is 10997881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18879901 - 2³ = 18879893 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 (18879907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496821 + ... + 496858.

It is an arithmetic number, because the mean of its divisors is an integer number (4968400).

Almost surely, 2^18879901 is an apocalyptic number.

It is an amenable number.

18879901 is a deficient number, since it is larger than the sum of its proper divisors (993699).

18879901 is an equidigital number, since it uses as much as digits as its factorization.

18879901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993698.

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

The square root of 18879901 is about 4345.1008043543. The cubic root of 18879901 is about 266.2767438439.

It can be divided in two parts, 188 and 79901, that added together give a square (80089 = 283²).

The spelling of 18879901 in words is "eighteen million, eight hundred seventy-nine thousand, nine hundred one".