851974 has 4 divisors (see below), whose sum is σ = 1277964. Its totient is φ = 425986.

The previous prime is 851971. The next prime is 852011. The reversal of 851974 is 479158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479158 = 2 ⋅239579.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212992 + ... + 212995.

It is an arithmetic number, because the mean of its divisors is an integer number (319491).

2⁸⁵¹⁹⁷⁴ is an apocalyptic number.

851974 is a deficient number, since it is larger than the sum of its proper divisors (425990).

851974 is a wasteful number, since it uses less digits than its factorization.

851974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425989.

The product of its digits is 10080, while the sum is 34.

The square root of 851974 is about 923.0243767095. The cubic root of 851974 is about 94.8000967318.

Subtracting from 851974 its reverse (479158), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 851974 in words is "eight hundred fifty-one thousand, nine hundred seventy-four".