18789945 has 8 divisors (see below), whose sum is σ = 30063936. Its totient is φ = 10021296.

The previous prime is 18789923. The next prime is 18789959. The reversal of 18789945 is 54998781.

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

It is not a de Polignac number, because 18789945 - 2⁷ = 18789817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626317 + ... + 626346.

It is an arithmetic number, because the mean of its divisors is an integer number (3757992).

Almost surely, 2^18789945 is an apocalyptic number.

18789945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18789945 is a deficient number, since it is larger than the sum of its proper divisors (11273991).

18789945 is a wasteful number, since it uses less digits than its factorization.

18789945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252671.

The product of its digits is 725760, while the sum is 51.

The square root of 18789945 is about 4334.7370162445. The cubic root of 18789945 is about 265.8531658001.

The spelling of 18789945 in words is "eighteen million, seven hundred eighty-nine thousand, nine hundred forty-five".