79801439 has 2 divisors, whose sum is σ = 79801440. Its totient is φ = 79801438.

The previous prime is 79801433. The next prime is 79801459. The reversal of 79801439 is 93410897.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79801439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79801396 and 79801405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79801433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39900719 + 39900720.

It is an arithmetic number, because the mean of its divisors is an integer number (39900720).

Almost surely, 2^79801439 is an apocalyptic number.

79801439 is a deficient number, since it is larger than the sum of its proper divisors (1).

79801439 is an equidigital number, since it uses as much as digits as its factorization.

79801439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 79801439 is about 8933.1651165754. The cubic root of 79801439 is about 430.5301537403.

The spelling of 79801439 in words is "seventy-nine million, eight hundred one thousand, four hundred thirty-nine".