87919 has 4 divisors (see below), whose sum is σ = 94696. Its totient is φ = 81144.

The previous prime is 87917. The next prime is 87931. The reversal of 87919 is 91978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91978 = 2 ⋅45989.

It is a cyclic number.

It is not a de Polignac number, because 87919 - 2¹ = 87917 is a prime.

It is a super-2 number, since 2×87919² = 15459501122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87911) 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, 3369 + ... + 3394.

It is an arithmetic number, because the mean of its divisors is an integer number (23674).

2⁸⁷⁹¹⁹ is an apocalyptic number.

87919 is a deficient number, since it is larger than the sum of its proper divisors (6777).

87919 is a wasteful number, since it uses less digits than its factorization.

87919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6776.

The product of its digits is 4536, while the sum is 34.

The square root of 87919 is about 296.5113825808. The cubic root of 87919 is about 44.4659504715.

It can be divided in two parts, 879 and 19, that added together give a palindrome (898).

The spelling of 87919 in words is "eighty-seven thousand, nine hundred nineteen".