864187838 has 8 divisors (see below), whose sum is σ = 1296416640. Its totient is φ = 432048960.

The previous prime is 864187823. The next prime is 864187853. The reversal of 864187838 is 838781468.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (864187823) and next prime (864187853).

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

It is a super-2 number, since 2×864187838² = 1493641238694228488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 864187838.

It is a congruent number.

It is an unprimeable number.

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, 12323 + ... + 43361.

It is an arithmetic number, because the mean of its divisors is an integer number (162052080).

Almost surely, 2^864187838 is an apocalyptic number.

864187838 is a deficient number, since it is larger than the sum of its proper divisors (432228802).

864187838 is a wasteful number, since it uses less digits than its factorization.

864187838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44962.

The product of its digits is 2064384, while the sum is 53.

The square root of 864187838 is about 29397.0719290204. The cubic root of 864187838 is about 952.5096479942.

The spelling of 864187838 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred thirty-eight".