87879839 has 2 divisors, whose sum is σ = 87879840. Its totient is φ = 87879838.

The previous prime is 87879829. The next prime is 87879853. The reversal of 87879839 is 93897878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87879839 - 2¹⁶ = 87814303 is a prime.

It is a super-2 number, since 2×87879839² = 15445732205331842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87879829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43939919 + 43939920.

It is an arithmetic number, because the mean of its divisors is an integer number (43939920).

Almost surely, 2^87879839 is an apocalyptic number.

87879839 is a deficient number, since it is larger than the sum of its proper divisors (1).

87879839 is an equidigital number, since it uses as much as digits as its factorization.

87879839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 59.

The square root of 87879839 is about 9374.4247290167. The cubic root of 87879839 is about 444.5934746307.

The spelling of 87879839 in words is "eighty-seven million, eight hundred seventy-nine thousand, eight hundred thirty-nine".