851404 has 6 divisors (see below), whose sum is σ = 1489964. Its totient is φ = 425700.

The previous prime is 851401. The next prime is 851413. The reversal of 851404 is 404158.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (851401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106422 + ... + 106429.

2⁸⁵¹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

851404 is a deficient number, since it is larger than the sum of its proper divisors (638560).

851404 is a wasteful number, since it uses less digits than its factorization.

851404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212855 (or 212853 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 851404 is about 922.7155574715. The cubic root of 851404 is about 94.7789505034.

The spelling of 851404 in words is "eight hundred fifty-one thousand, four hundred four".