1591016940 has 72 divisors (see below), whose sum is σ = 4850445600. Its totient is φ = 422129664.

The previous prime is 1591016929. The next prime is 1591016971. The reversal of 1591016940 is 496101951.

1591016940 is a `hidden beast` number, since 1 + 591 + 0 + 1 + 69 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1591016895 and 1591016904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13612 + ... + 58028.

It is an arithmetic number, because the mean of its divisors is an integer number (67367300).

Almost surely, 2^1591016940 is an apocalyptic number.

1591016940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1591016940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425222800).

1591016940 is an abundant number, since it is smaller than the sum of its proper divisors (3259428660).

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

1591016940 is a wasteful number, since it uses less digits than its factorization.

1591016940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44631 (or 44626 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1591016940 is about 39887.5536978642. The cubic root of 1591016940 is about 1167.4141004591.

The spelling of 1591016940 in words is "one billion, five hundred ninety-one million, sixteen thousand, nine hundred forty".