18870994 has 8 divisors (see below), whose sum is σ = 29537280. Its totient is φ = 9025236.

The previous prime is 18870959. The next prime is 18870997. The reversal of 18870994 is 49907881.

It is a happy number.

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

It is a super-2 number, since 2×18870994² = 712228829096072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 410239 = 18870994 / (1 + 8 + 8 + 7 + 0 + 9 + 9 + 4).

It is not an unprimeable number, because it can be changed into a prime (18870997) 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, 205074 + ... + 205165.

It is an arithmetic number, because the mean of its divisors is an integer number (3692160).

Almost surely, 2^18870994 is an apocalyptic number.

18870994 is a deficient number, since it is larger than the sum of its proper divisors (10666286).

18870994 is a wasteful number, since it uses less digits than its factorization.

18870994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410264.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18870994 is about 4344.0757359880. The cubic root of 18870994 is about 266.2348633272.

The spelling of 18870994 in words is "eighteen million, eight hundred seventy thousand, nine hundred ninety-four".