79998421 has 8 divisors (see below), whose sum is σ = 82200384. Its totient is φ = 77808480.

The previous prime is 79998419. The next prime is 79998427. The reversal of 79998421 is 12489997.

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 79998421 - 2¹ = 79998419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79998427) 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, 11416 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (10275048).

Almost surely, 2^79998421 is an apocalyptic number.

It is an amenable number.

79998421 is a deficient number, since it is larger than the sum of its proper divisors (2201963).

79998421 is a wasteful number, since it uses less digits than its factorization.

79998421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011.

The product of its digits is 326592, while the sum is 49.

The square root of 79998421 is about 8944.1836407802. The cubic root of 79998421 is about 430.8841031107.

The spelling of 79998421 in words is "seventy-nine million, nine hundred ninety-eight thousand, four hundred twenty-one".