18979945 has 16 divisors (see below), whose sum is σ = 23945472. Its totient is φ = 14414400.

The previous prime is 18979937. The next prime is 18979951. The reversal of 18979945 is 54997981.

It is not a de Polignac number, because 18979945 - 2³ = 18979937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18979892 and 18979901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16819 + ... + 17911.

It is an arithmetic number, because the mean of its divisors is an integer number (1496592).

Almost surely, 2^18979945 is an apocalyptic number.

It is an amenable number.

18979945 is a deficient number, since it is larger than the sum of its proper divisors (4965527).

18979945 is a wasteful number, since it uses less digits than its factorization.

18979945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its digits is 816480, while the sum is 52.

The square root of 18979945 is about 4356.5978698980. The cubic root of 18979945 is about 266.7462462145.

The spelling of 18979945 in words is "eighteen million, nine hundred seventy-nine thousand, nine hundred forty-five".