856191380 has 24 divisors (see below), whose sum is σ = 1961457120. Its totient is φ = 311342240.

The previous prime is 856191341. The next prime is 856191431. The reversal of 856191380 is 83191658.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1945670 + ... + 1946109.

It is an arithmetic number, because the mean of its divisors is an integer number (81727380).

Almost surely, 2^856191380 is an apocalyptic number.

It is an amenable number.

856191380 is an abundant number, since it is smaller than the sum of its proper divisors (1105265740).

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

856191380 is a wasteful number, since it uses less digits than its factorization.

856191380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891799 (or 3891797 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 856191380 is about 29260.7481107370. The cubic root of 856191380 is about 949.5626352403.

The spelling of 856191380 in words is "eight hundred fifty-six million, one hundred ninety-one thousand, three hundred eighty".