18983945 has 8 divisors (see below), whose sum is σ = 23979840. Its totient is φ = 14387760.

The previous prime is 18983929. The next prime is 18983957. The reversal of 18983945 is 54938981.

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

It is not a de Polignac number, because 18983945 - 2⁴ = 18983929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18983945.

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, 99821 + ... + 100010.

It is an arithmetic number, because the mean of its divisors is an integer number (2997480).

Almost surely, 2^18983945 is an apocalyptic number.

It is an amenable number.

18983945 is a deficient number, since it is larger than the sum of its proper divisors (4995895).

18983945 is a wasteful number, since it uses less digits than its factorization.

18983945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199855.

The product of its digits is 311040, while the sum is 47.

The square root of 18983945 is about 4357.0569195272. The cubic root of 18983945 is about 266.7649837124.

The spelling of 18983945 in words is "eighteen million, nine hundred eighty-three thousand, nine hundred forty-five".