87891239 has 8 divisors (see below), whose sum is σ = 89456640. Its totient is φ = 86339736.

The previous prime is 87891233. The next prime is 87891253. The reversal of 87891239 is 93219878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87891239 - 2¹² = 87887143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87891193 and 87891202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87891233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9722 + ... + 16440.

It is an arithmetic number, because the mean of its divisors is an integer number (11182080).

Almost surely, 2^87891239 is an apocalyptic number.

87891239 is a deficient number, since it is larger than the sum of its proper divisors (1565401).

87891239 is a wasteful number, since it uses less digits than its factorization.

87891239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949.

The product of its digits is 217728, while the sum is 47.

The square root of 87891239 is about 9375.0327466095. The cubic root of 87891239 is about 444.6126984046.

The spelling of 87891239 in words is "eighty-seven million, eight hundred ninety-one thousand, two hundred thirty-nine".