87499839 has 24 divisors (see below), whose sum is σ = 137055360. Its totient is φ = 49505904.

The previous prime is 87499829. The next prime is 87499849. The reversal of 87499839 is 93899478.

It is an interprime number because it is at equal distance from previous prime (87499829) and next prime (87499849).

It is not a de Polignac number, because 87499839 - 2⁴ = 87499823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87499829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12252 + ... + 18030.

It is an arithmetic number, because the mean of its divisors is an integer number (5710640).

Almost surely, 2^87499839 is an apocalyptic number.

87499839 is a deficient number, since it is larger than the sum of its proper divisors (49555521).

87499839 is a wasteful number, since it uses less digits than its factorization.

87499839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899 (or 5892 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 87499839 is about 9354.1348611189. The cubic root of 87499839 is about 443.9517285806.

The spelling of 87499839 in words is "eighty-seven million, four hundred ninety-nine thousand, eight hundred thirty-nine".