87397919 has 12 divisors (see below), whose sum is σ = 101954304. Its totient is φ = 74700864.

The previous prime is 87397889. The next prime is 87397931. The reversal of 87397919 is 91979378.

It is a de Polignac number, because none of the positive numbers 2^k-87397919 is a prime.

It is a super-2 number, since 2×87397919² = 15276792491061122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87397979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16439 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (8496192).

Almost surely, 2^87397919 is an apocalyptic number.

87397919 is a deficient number, since it is larger than the sum of its proper divisors (14556385).

87397919 is a wasteful number, since it uses less digits than its factorization.

87397919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054 (or 5047 counting only the distinct ones).

The product of its digits is 857304, while the sum is 53.

The square root of 87397919 is about 9348.6854156079. The cubic root of 87397919 is about 443.7792896358.

The spelling of 87397919 in words is "eighty-seven million, three hundred ninety-seven thousand, nine hundred nineteen".