79954389 has 6 divisors (see below), whose sum is σ = 115489686. Its totient is φ = 53302920.

The previous prime is 79954351. The next prime is 79954403. The reversal of 79954389 is 98345997.

79954389 is a `hidden beast` number, since 7 + 99 + 543 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50339025 + 29615364 = 7095^2 + 5442^2 .

It is not a de Polignac number, because 79954389 - 2⁹ = 79953877 is a prime.

It is a super-3 number, since 3×79954389³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79954339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4441902 + ... + 4441919.

It is an arithmetic number, because the mean of its divisors is an integer number (19248281).

Almost surely, 2^79954389 is an apocalyptic number.

It is an amenable number.

79954389 is a deficient number, since it is larger than the sum of its proper divisors (35535297).

79954389 is a wasteful number, since it uses less digits than its factorization.

79954389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8883827 (or 8883824 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 79954389 is about 8941.7218140580. The cubic root of 79954389 is about 430.8050341717.

Subtracting from 79954389 its sum of digits (54), we obtain a triangular number (79954335 = T₁₂₆₄₅).

The spelling of 79954389 in words is "seventy-nine million, nine hundred fifty-four thousand, three hundred eighty-nine".