851490 has 24 divisors (see below), whose sum is σ = 2214108. Its totient is φ = 227040.

The previous prime is 851471. The next prime is 851491. The reversal of 851490 is 94158.

It can be written as a sum of positive squares in 2 ways, for example, as 848241 + 3249 = 921^2 + 57^2 .

It is not an unprimeable number, because it can be changed into a prime (851491) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4641 + ... + 4820.

2⁸⁵¹⁴⁹⁰ is an apocalyptic number.

851490 is an abundant number, since it is smaller than the sum of its proper divisors (1362618).

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

851490 is a wasteful number, since it uses less digits than its factorization.

851490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9474 (or 9471 counting only the distinct ones).

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

The square root of 851490 is about 922.7621578717. The cubic root of 851490 is about 94.7821415914.

The spelling of 851490 in words is "eight hundred fifty-one thousand, four hundred ninety".