855409723 has 16 divisors (see below), whose sum is σ = 1070815680. Its totient is φ = 666279936.

The previous prime is 855409679. The next prime is 855409727. The reversal of 855409723 is 327904558.

It is a de Polignac number, because none of the positive numbers 2^k-855409723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855409723.

It is not an unprimeable number, because it can be changed into a prime (855409727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120486 + ... + 127387.

It is an arithmetic number, because the mean of its divisors is an integer number (66925980).

Almost surely, 2^855409723 is an apocalyptic number.

855409723 is a deficient number, since it is larger than the sum of its proper divisors (215405957).

855409723 is a wasteful number, since it uses less digits than its factorization.

855409723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247926.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 855409723 is about 29247.3883107535. The cubic root of 855409723 is about 949.2735806023.

The spelling of 855409723 in words is "eight hundred fifty-five million, four hundred nine thousand, seven hundred twenty-three".