19479923 has 4 divisors (see below), whose sum is σ = 19799328. Its totient is φ = 19160520.

The previous prime is 19479917. The next prime is 19479931. The reversal of 19479923 is 32997491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19479923 - 2¹⁶ = 19414387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19479983) 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, 159611 + ... + 159732.

It is an arithmetic number, because the mean of its divisors is an integer number (4949832).

Almost surely, 2^19479923 is an apocalyptic number.

19479923 is a deficient number, since it is larger than the sum of its proper divisors (319405).

19479923 is an equidigital number, since it uses as much as digits as its factorization.

19479923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319404.

The product of its digits is 122472, while the sum is 44.

The square root of 19479923 is about 4413.6065751265. The cubic root of 19479923 is about 269.0682238752.

It can be divided in two parts, 19479 and 923, that added together give a palindrome (20402).

The spelling of 19479923 in words is "nineteen million, four hundred seventy-nine thousand, nine hundred twenty-three".