855404431 has 16 divisors (see below), whose sum is σ = 1021906944. Its totient is φ = 700089984.

The previous prime is 855404413. The next prime is 855404441. The reversal of 855404431 is 134404558.

It is a cyclic number.

It is not a de Polignac number, because 855404431 - 2⁹ = 855403919 is a prime.

It is a super-2 number, since 2×855404431² = 1463433481148867522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855404411) 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, 93351 + ... + 102103.

It is an arithmetic number, because the mean of its divisors is an integer number (63869184).

Almost surely, 2^855404431 is an apocalyptic number.

855404431 is a deficient number, since it is larger than the sum of its proper divisors (166502513).

855404431 is a wasteful number, since it uses less digits than its factorization.

855404431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9390.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 855404431 is about 29247.2978409972. The cubic root of 855404431 is about 949.2716230350.

Adding to 855404431 its reverse (134404558), we get a palindrome (989808989).

The spelling of 855404431 in words is "eight hundred fifty-five million, four hundred four thousand, four hundred thirty-one".