87439389 has 16 divisors (see below), whose sum is σ = 118220928. Its totient is φ = 57480192.

The previous prime is 87439369. The next prime is 87439393. The reversal of 87439389 is 98393478.

It is not a de Polignac number, because 87439389 - 2¹⁵ = 87406621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87439369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141409 + ... + 142025.

It is an arithmetic number, because the mean of its divisors is an integer number (7388808).

Almost surely, 2^87439389 is an apocalyptic number.

It is an amenable number.

87439389 is a deficient number, since it is larger than the sum of its proper divisors (30781539).

87439389 is a wasteful number, since it uses less digits than its factorization.

87439389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204.

The product of its digits is 1306368, while the sum is 51.

The square root of 87439389 is about 9350.9031114647. The cubic root of 87439389 is about 443.8494690990.

The spelling of 87439389 in words is "eighty-seven million, four hundred thirty-nine thousand, three hundred eighty-nine".