87970439 has 4 divisors (see below), whose sum is σ = 88127256. Its totient is φ = 87813624.

The previous prime is 87970433. The next prime is 87970447. The reversal of 87970439 is 93407978.

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 87970439 - 2¹² = 87966343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87970393 and 87970402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87970433) 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, 77564 + ... + 78689.

It is an arithmetic number, because the mean of its divisors is an integer number (22031814).

Almost surely, 2^87970439 is an apocalyptic number.

87970439 is a deficient number, since it is larger than the sum of its proper divisors (156817).

87970439 is a wasteful number, since it uses less digits than its factorization.

87970439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156816.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 87970439 is about 9379.2557807110. The cubic root of 87970439 is about 444.7462071757.

The spelling of 87970439 in words is "eighty-seven million, nine hundred seventy thousand, four hundred thirty-nine".