19479959 has 4 divisors (see below), whose sum is σ = 20505240. Its totient is φ = 18454680.

The previous prime is 19479947. The next prime is 19479979. The reversal of 19479959 is 95997491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95997491 = 1259 ⋅76249.

It is a cyclic number.

It is not a de Polignac number, because 19479959 - 2⁸ = 19479703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19479959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19479979) 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, 512612 + ... + 512649.

It is an arithmetic number, because the mean of its divisors is an integer number (5126310).

Almost surely, 2^19479959 is an apocalyptic number.

19479959 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19479959 is a deficient number, since it is larger than the sum of its proper divisors (1025281).

19479959 is a wasteful number, since it uses less digits than its factorization.

19479959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025280.

The product of its digits is 918540, while the sum is 53.

The square root of 19479959 is about 4413.6106534220. The cubic root of 19479959 is about 269.0683896262.

The spelling of 19479959 in words is "nineteen million, four hundred seventy-nine thousand, nine hundred fifty-nine".