87406939 has 4 divisors (see below), whose sum is σ = 87433200. Its totient is φ = 87380680.

The previous prime is 87406937. The next prime is 87406951. The reversal of 87406939 is 93960478.

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 87406939 - 2¹ = 87406937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87406931) 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, 7264 + ... + 15085.

It is an arithmetic number, because the mean of its divisors is an integer number (21858300).

Almost surely, 2^87406939 is an apocalyptic number.

87406939 is a deficient number, since it is larger than the sum of its proper divisors (26261).

87406939 is a wasteful number, since it uses less digits than its factorization.

87406939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26260.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 87406939 is about 9349.1678239296. The cubic root of 87406939 is about 443.7945560233.

The spelling of 87406939 in words is "eighty-seven million, four hundred six thousand, nine hundred thirty-nine".