79870019 has 2 divisors, whose sum is σ = 79870020. Its totient is φ = 79870018.

The previous prime is 79870003. The next prime is 79870039. The reversal of 79870019 is 91007897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79870019 - 2⁴ = 79870003 is a prime.

It is a super-2 number, since 2×79870019² = 12758439870120722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79870039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39935009 + 39935010.

It is an arithmetic number, because the mean of its divisors is an integer number (39935010).

Almost surely, 2^79870019 is an apocalyptic number.

79870019 is a deficient number, since it is larger than the sum of its proper divisors (1).

79870019 is an equidigital number, since it uses as much as digits as its factorization.

79870019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 79870019 is about 8937.0027973589. The cubic root of 79870019 is about 430.6534485262.

The spelling of 79870019 in words is "seventy-nine million, eight hundred seventy thousand, nineteen".