851401590 has 128 divisors (see below), whose sum is σ = 2344204800. Its totient is φ = 196162560.

The previous prime is 851401589. The next prime is 851401597. The reversal of 851401590 is 95104158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851401597) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 658845 + ... + 660135.

It is an arithmetic number, because the mean of its divisors is an integer number (18314100).

Almost surely, 2^851401590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851401590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172102400).

851401590 is an abundant number, since it is smaller than the sum of its proper divisors (1492803210).

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

851401590 is a wasteful number, since it uses less digits than its factorization.

851401590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 851401590 is about 29178.7866437246. The cubic root of 851401590 is about 947.7886107566.

The spelling of 851401590 in words is "eight hundred fifty-one million, four hundred one thousand, five hundred ninety".