865874893 has 4 divisors (see below), whose sum is σ = 932480668. Its totient is φ = 799269120.

The previous prime is 865874887. The next prime is 865874903. The reversal of 865874893 is 398478568.

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 40921609 + 824953284 = 6397^2 + 28722^2 .

It is not a de Polignac number, because 865874893 - 2²¹ = 863777741 is a prime.

It is a super-2 number, since 2×865874893² = 1499478660655522898, 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 (865874803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33302868 + ... + 33302893.

It is an arithmetic number, because the mean of its divisors is an integer number (233120167).

Almost surely, 2^865874893 is an apocalyptic number.

It is an amenable number.

865874893 is a deficient number, since it is larger than the sum of its proper divisors (66605775).

865874893 is a wasteful number, since it uses less digits than its factorization.

865874893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66605774.

The product of its digits is 11612160, while the sum is 58.

The square root of 865874893 is about 29425.7522078876. The cubic root of 865874893 is about 953.1290702798.

The spelling of 865874893 in words is "eight hundred sixty-five million, eight hundred seventy-four thousand, eight hundred ninety-three".