851630 has 16 divisors (see below), whose sum is σ = 1651104. Its totient is φ = 314400.

The previous prime is 851623. The next prime is 851633. The reversal of 851630 is 36158.

It is a junction number, because it is equal to n+sod(n) for n = 851596 and 851605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851633) by changing a digit.

851630 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, 3146 + ... + 3405.

It is an arithmetic number, because the mean of its divisors is an integer number (103194).

2⁸⁵¹⁶³⁰ is an apocalyptic number.

851630 is a deficient number, since it is larger than the sum of its proper divisors (799474).

851630 is a wasteful number, since it uses less digits than its factorization.

851630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 851630 is about 922.8380139548. The cubic root of 851630 is about 94.7873359263.

Adding to 851630 its reverse (36158), we get a palindrome (887788).

It can be divided in two parts, 851 and 630, that multiplied together give a triangular number (536130 = T₁₀₃₅).

The spelling of 851630 in words is "eight hundred fifty-one thousand, six hundred thirty".