79421887 has 2 divisors, whose sum is σ = 79421888. Its totient is φ = 79421886.

The previous prime is 79421873. The next prime is 79421911. The reversal of 79421887 is 78812497.

It is a weak prime.

It is an emirp because it is prime and its reverse (78812497) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79421887 is a prime.

It is a super-3 number, since 3×79421887³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79421827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39710943 + 39710944.

It is an arithmetic number, because the mean of its divisors is an integer number (39710944).

Almost surely, 2^79421887 is an apocalyptic number.

79421887 is a deficient number, since it is larger than the sum of its proper divisors (1).

79421887 is an equidigital number, since it uses as much as digits as its factorization.

79421887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 79421887 is about 8911.8958140230. The cubic root of 79421887 is about 429.8465055174.

It can be divided in two parts, 79421 and 887, that added together give a palindrome (80308).

The spelling of 79421887 in words is "seventy-nine million, four hundred twenty-one thousand, eight hundred eighty-seven".