859091940 has 384 divisors, whose sum is σ = 3353011200. Its totient is φ = 178053120.

The previous prime is 859091939. The next prime is 859091941. The reversal of 859091940 is 49190958.

859091940 is a `hidden beast` number, since 8 + 590 + 9 + 19 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (859091939) and next prime (859091941).

It is a super-2 number, since 2×859091940² = 1476077922745927200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (859091941) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1863310 + ... + 1863770.

It is an arithmetic number, because the mean of its divisors is an integer number (8731800).

Almost surely, 2^859091940 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 859091940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676505600).

859091940 is an abundant number, since it is smaller than the sum of its proper divisors (2493919260).

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

859091940 is a wasteful number, since it uses less digits than its factorization.

859091940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 859091940 is about 29310.2702136981. The cubic root of 859091940 is about 950.6337193665.

The spelling of 859091940 in words is "eight hundred fifty-nine million, ninety-one thousand, nine hundred forty".