855213765 has 16 divisors (see below), whose sum is σ = 1563819648. Its totient is φ = 390954816.

The previous prime is 855213757. The next prime is 855213773. The reversal of 855213765 is 567312558.

It is an interprime number because it is at equal distance from previous prime (855213757) and next prime (855213773).

It is not a de Polignac number, because 855213765 - 2³ = 855213757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4072342 + ... + 4072551.

It is an arithmetic number, because the mean of its divisors is an integer number (97738728).

Almost surely, 2^855213765 is an apocalyptic number.

It is an amenable number.

855213765 is a deficient number, since it is larger than the sum of its proper divisors (708605883).

855213765 is a wasteful number, since it uses less digits than its factorization.

855213765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144908.

The product of its digits is 252000, while the sum is 42.

The square root of 855213765 is about 29244.0381103568. The cubic root of 855213765 is about 949.2010882619.

The spelling of 855213765 in words is "eight hundred fifty-five million, two hundred thirteen thousand, seven hundred sixty-five".