87439187 has 4 divisors (see below), whose sum is σ = 95388216. Its totient is φ = 79490160.

The previous prime is 87439171. The next prime is 87439199. The reversal of 87439187 is 78193478.

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 87439187 - 2⁴ = 87439171 is a prime.

It is a super-2 number, since 2×87439187² = 15291222846441938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87433187) 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, 3974498 + ... + 3974519.

It is an arithmetic number, because the mean of its divisors is an integer number (23847054).

Almost surely, 2^87439187 is an apocalyptic number.

87439187 is a deficient number, since it is larger than the sum of its proper divisors (7949029).

87439187 is a wasteful number, since it uses less digits than its factorization.

87439187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7949028.

The product of its digits is 338688, while the sum is 47.

The square root of 87439187 is about 9350.8923103627. The cubic root of 87439187 is about 443.8491273092.

It can be divided in two parts, 874391 and 87, that added together give a palindrome (874478).

The spelling of 87439187 in words is "eighty-seven million, four hundred thirty-nine thousand, one hundred eighty-seven".