851940 has 36 divisors (see below), whose sum is σ = 2584764. Its totient is φ = 227136.

The previous prime is 851899. The next prime is 851953. The reversal of 851940 is 49158.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 627264 = 474^2 + 792^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2187 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (71799).

2⁸⁵¹⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

851940 is an abundant number, since it is smaller than the sum of its proper divisors (1732824).

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

851940 is a wasteful number, since it uses less digits than its factorization.

851940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748 (or 4743 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 851940 is about 923.0059588107. The cubic root of 851940 is about 94.7988356424.

It can be divided in two parts, 85 and 1940, that added together give a square (2025 = 45²).

The spelling of 851940 in words is "eight hundred fifty-one thousand, nine hundred forty".