865394001 has 12 divisors (see below), whose sum is σ = 1250454660. Its totient is φ = 576725760.

The previous prime is 865393967. The next prime is 865394003. The reversal of 865394001 is 100493568.

865394001 is a `hidden beast` number, since 86 + 539 + 40 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 273737025 + 591656976 = 16545^2 + 24324^2 .

It is not a de Polignac number, because 865394001 - 2¹⁷ = 865262929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865394003) 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, 12685 + ... + 43493.

It is an arithmetic number, because the mean of its divisors is an integer number (104204555).

Almost surely, 2^865394001 is an apocalyptic number.

It is an amenable number.

865394001 is a deficient number, since it is larger than the sum of its proper divisors (385060659).

865394001 is a wasteful number, since it uses less digits than its factorization.

865394001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33936 (or 33933 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 865394001 is about 29417.5797950817. The cubic root of 865394001 is about 952.9525871149.

The spelling of 865394001 in words is "eight hundred sixty-five million, three hundred ninety-four thousand, one".