17979923 has 8 divisors (see below), whose sum is σ = 19428528. Its totient is φ = 16540704.

The previous prime is 17979917. The next prime is 17979937. The reversal of 17979923 is 32997971.

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

It is a cyclic number.

It is not a de Polignac number, because 17979923 - 2¹⁸ = 17717779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17976923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940 + ... + 6302.

It is an arithmetic number, because the mean of its divisors is an integer number (2428566).

Almost surely, 2^17979923 is an apocalyptic number.

17979923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

17979923 is a deficient number, since it is larger than the sum of its proper divisors (1448605).

17979923 is a wasteful number, since it uses less digits than its factorization.

17979923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693.

The product of its digits is 214326, while the sum is 47.

The square root of 17979923 is about 4240.2739298305. The cubic root of 17979923 is about 261.9766649769.

The spelling of 17979923 in words is "seventeen million, nine hundred seventy-nine thousand, nine hundred twenty-three".