18978095 has 4 divisors (see below), whose sum is σ = 22773720. Its totient is φ = 15182472.

The previous prime is 18978079. The next prime is 18978097. The reversal of 18978095 is 59087981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18978095 - 2⁴ = 18978079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978097) 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, 1897805 + ... + 1897814.

It is an arithmetic number, because the mean of its divisors is an integer number (5693430).

Almost surely, 2^18978095 is an apocalyptic number.

18978095 is a deficient number, since it is larger than the sum of its proper divisors (3795625).

18978095 is an equidigital number, since it uses as much as digits as its factorization.

18978095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795624.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18978095 is about 4356.3855430850. The cubic root of 18978095 is about 266.7375792314.

The spelling of 18978095 in words is "eighteen million, nine hundred seventy-eight thousand, ninety-five".