87396139 has 2 divisors, whose sum is σ = 87396140. Its totient is φ = 87396138.

The previous prime is 87396107. The next prime is 87396151. The reversal of 87396139 is 93169378.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87396139 - 2⁵ = 87396107 is a prime.

It is a super-2 number, since 2×87396139² = 15276170224214642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87396539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43698069 + 43698070.

It is an arithmetic number, because the mean of its divisors is an integer number (43698070).

Almost surely, 2^87396139 is an apocalyptic number.

87396139 is a deficient number, since it is larger than the sum of its proper divisors (1).

87396139 is an equidigital number, since it uses as much as digits as its factorization.

87396139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 87396139 is about 9348.5902145725. The cubic root of 87396139 is about 443.7762768543.

It can be divided in two parts, 8739 and 6139, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 87396139 in words is "eighty-seven million, three hundred ninety-six thousand, one hundred thirty-nine".