855973990 has 16 divisors (see below), whose sum is σ = 1556010000. Its totient is φ = 338999200.

The previous prime is 855973973. The next prime is 855974027. The reversal of 855973990 is 99379558.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422740 + ... + 424759.

It is an arithmetic number, because the mean of its divisors is an integer number (97250625).

Almost surely, 2^855973990 is an apocalyptic number.

855973990 is a deficient number, since it is larger than the sum of its proper divisors (700036010).

855973990 is a wasteful number, since it uses less digits than its factorization.

855973990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847607.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The square root of 855973990 is about 29257.0331715299. The cubic root of 855973990 is about 949.4822626743.

The spelling of 855973990 in words is "eight hundred fifty-five million, nine hundred seventy-three thousand, nine hundred ninety".