851742 has 16 divisors (see below), whose sum is σ = 1892880. Its totient is φ = 283896.

The previous prime is 851731. The next prime is 851749. The reversal of 851742 is 247158.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851742.

It is not an unprimeable number, because it can be changed into a prime (851749) by changing a digit.

851742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7833 + ... + 7940.

It is an arithmetic number, because the mean of its divisors is an integer number (118305).

2⁸⁵¹⁷⁴² is an apocalyptic number.

851742 is an abundant number, since it is smaller than the sum of its proper divisors (1041138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851742 is a wasteful number, since it uses less digits than its factorization.

851742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15784 (or 15778 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 851742 is about 922.8986943322. The cubic root of 851742 is about 94.7914909844.

The spelling of 851742 in words is "eight hundred fifty-one thousand, seven hundred forty-two".