851722452 has 120 divisors (see below), whose sum is σ = 2565556224. Its totient is φ = 241351488.

The previous prime is 851722439. The next prime is 851722483. The reversal of 851722452 is 254227158.

It is a happy number.

It is a super-2 number, since 2×851722452² = 1450862270481784608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 286558 + ... + 289514.

Almost surely, 2^851722452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851722452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282778112).

851722452 is an abundant number, since it is smaller than the sum of its proper divisors (1713833772).

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

851722452 is a wasteful number, since it uses less digits than its factorization.

851722452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3096 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 851722452 is about 29184.2843324965. The cubic root of 851722452 is about 947.9076580461.

The spelling of 851722452 in words is "eight hundred fifty-one million, seven hundred twenty-two thousand, four hundred fifty-two".