87372139 has 4 divisors (see below), whose sum is σ = 87855040. Its totient is φ = 86889240.

The previous prime is 87372137. The next prime is 87372169. The reversal of 87372139 is 93127378.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87372139 - 2¹ = 87372137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87372137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241179 + ... + 241540.

It is an arithmetic number, because the mean of its divisors is an integer number (21963760).

Almost surely, 2^87372139 is an apocalyptic number.

87372139 is a deficient number, since it is larger than the sum of its proper divisors (482901).

87372139 is a wasteful number, since it uses less digits than its factorization.

87372139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482900.

The product of its digits is 63504, while the sum is 40.

The square root of 87372139 is about 9347.3065104339. The cubic root of 87372139 is about 443.7356510866.

The spelling of 87372139 in words is "eighty-seven million, three hundred seventy-two thousand, one hundred thirty-nine".