79843889 has 2 divisors, whose sum is σ = 79843890. Its totient is φ = 79843888.

The previous prime is 79843859. The next prime is 79843919. The reversal of 79843889 is 98834897.

It is a balanced prime because it is at equal distance from previous prime (79843859) and next prime (79843919).

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 18879025 = 7808^2 + 4345^2 .

It is a cyclic number.

It is not a de Polignac number, because 79843889 - 2⁸ = 79843633 is a prime.

It is a super-2 number, since 2×79843889² = 12750093221288642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79843859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39921944 + 39921945.

It is an arithmetic number, because the mean of its divisors is an integer number (39921945).

Almost surely, 2^79843889 is an apocalyptic number.

It is an amenable number.

79843889 is a deficient number, since it is larger than the sum of its proper divisors (1).

79843889 is an equidigital number, since it uses as much as digits as its factorization.

79843889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 56.

The square root of 79843889 is about 8935.5407782629. The cubic root of 79843889 is about 430.6064797047.

The spelling of 79843889 in words is "seventy-nine million, eight hundred forty-three thousand, eight hundred eighty-nine".