79857419 has 2 divisors, whose sum is σ = 79857420. Its totient is φ = 79857418.

The previous prime is 79857413. The next prime is 79857431. The reversal of 79857419 is 91475897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79857419 - 2¹⁶ = 79791883 is a prime.

It is a super-2 number, since 2×79857419² = 12754414738683122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79857413) 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, 39928709 + 39928710.

It is an arithmetic number, because the mean of its divisors is an integer number (39928710).

Almost surely, 2^79857419 is an apocalyptic number.

79857419 is a deficient number, since it is larger than the sum of its proper divisors (1).

79857419 is an equidigital number, since it uses as much as digits as its factorization.

79857419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 79857419 is about 8936.2978352336. The cubic root of 79857419 is about 430.6308012346.

The spelling of 79857419 in words is "seventy-nine million, eight hundred fifty-seven thousand, four hundred nineteen".