853639380 has 144 divisors (see below), whose sum is σ = 2885186304. Its totient is φ = 202517760.

The previous prime is 853639373. The next prime is 853639421. The reversal of 853639380 is 83936358.

853639380 is a `hidden beast` number, since 8 + 5 + 3 + 639 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88474 + ... + 97646.

It is an arithmetic number, because the mean of its divisors is an integer number (20036016).

Almost surely, 2^853639380 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 853639380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442593152).

853639380 is an abundant number, since it is smaller than the sum of its proper divisors (2031546924).

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

853639380 is a wasteful number, since it uses less digits than its factorization.

853639380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9246 (or 9241 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 853639380 is about 29217.1076597257. The cubic root of 853639380 is about 948.6182609085.

The spelling of 853639380 in words is "eight hundred fifty-three million, six hundred thirty-nine thousand, three hundred eighty".