79401391 has 4 divisors (see below), whose sum is σ = 82139400. Its totient is φ = 76663384.

The previous prime is 79401341. The next prime is 79401401. The reversal of 79401391 is 19310497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19310497 = 53 ⋅364349.

It is a cyclic number.

It is not a de Polignac number, because 79401391 - 2¹¹ = 79399343 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 (79401341) 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, 1368961 + ... + 1369018.

It is an arithmetic number, because the mean of its divisors is an integer number (20534850).

Almost surely, 2^79401391 is an apocalyptic number.

79401391 is a deficient number, since it is larger than the sum of its proper divisors (2738009).

79401391 is a wasteful number, since it uses less digits than its factorization.

79401391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738008.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 79401391 is about 8910.7458161481. The cubic root of 79401391 is about 429.8095262401.

The spelling of 79401391 in words is "seventy-nine million, four hundred one thousand, three hundred ninety-one".