87399399 has 4 divisors (see below), whose sum is σ = 116532536. Its totient is φ = 58266264.

The previous prime is 87399383. The next prime is 87399421. The reversal of 87399399 is 99399378.

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

It is not a de Polignac number, because 87399399 - 2⁴ = 87399383 is a prime.

It is a super-2 number, since 2×87399399² = 15277309891122402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87399899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14566564 + ... + 14566569.

It is an arithmetic number, because the mean of its divisors is an integer number (29133134).

Almost surely, 2^87399399 is an apocalyptic number.

87399399 is a deficient number, since it is larger than the sum of its proper divisors (29133137).

87399399 is a wasteful number, since it uses less digits than its factorization.

87399399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29133136.

The product of its digits is 3306744, while the sum is 57.

The square root of 87399399 is about 9348.7645707869. The cubic root of 87399399 is about 443.7817946140.

The spelling of 87399399 in words is "eighty-seven million, three hundred ninety-nine thousand, three hundred ninety-nine".