86987405 has 4 divisors (see below), whose sum is σ = 104384892. Its totient is φ = 69589920.

The previous prime is 86987401. The next prime is 86987423. The reversal of 86987405 is 50478968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45333289 + 41654116 = 6733^2 + 6454^2 .

It is not a de Polignac number, because 86987405 - 2² = 86987401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86987405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86987401) 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, 8698736 + ... + 8698745.

It is an arithmetic number, because the mean of its divisors is an integer number (26096223).

Almost surely, 2^86987405 is an apocalyptic number.

It is an amenable number.

86987405 is a deficient number, since it is larger than the sum of its proper divisors (17397487).

86987405 is a wasteful number, since it uses less digits than its factorization.

86987405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17397486.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 86987405 is about 9326.7038657824. The cubic root of 86987405 is about 443.0833783616.

The spelling of 86987405 in words is "eighty-six million, nine hundred eighty-seven thousand, four hundred five".