286257138 has 8 divisors (see below), whose sum is σ = 572514288. Its totient is φ = 95419044.

The previous prime is 286257133. The next prime is 286257143. The reversal of 286257138 is 831752682.

It is an interprime number because it is at equal distance from previous prime (286257133) and next prime (286257143).

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

286257138 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 286257138.

It is not an unprimeable number, because it can be changed into a prime (286257133) 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, 23854756 + ... + 23854767.

It is an arithmetic number, because the mean of its divisors is an integer number (71564286).

Almost surely, 2^286257138 is an apocalyptic number.

286257138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

286257138 is a wasteful number, since it uses less digits than its factorization.

286257138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47709528.

The product of its digits is 161280, while the sum is 42.

The square root of 286257138 is about 16919.1352615906. The cubic root of 286257138 is about 659.0506230861.

The spelling of 286257138 in words is "two hundred eighty-six million, two hundred fifty-seven thousand, one hundred thirty-eight".