87434839 has 4 divisors (see below), whose sum is σ = 88021800. Its totient is φ = 86847880.

The previous prime is 87434833. The next prime is 87434857. The reversal of 87434839 is 93843478.

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 87434839 - 2⁹ = 87434327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87434833) 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, 293257 + ... + 293554.

It is an arithmetic number, because the mean of its divisors is an integer number (22005450).

Almost surely, 2^87434839 is an apocalyptic number.

87434839 is a deficient number, since it is larger than the sum of its proper divisors (586961).

87434839 is a wasteful number, since it uses less digits than its factorization.

87434839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586960.

The product of its digits is 580608, while the sum is 46.

The square root of 87434839 is about 9350.6598162910. The cubic root of 87434839 is about 443.8417702418.

The spelling of 87434839 in words is "eighty-seven million, four hundred thirty-four thousand, eight hundred thirty-nine".