1591880940 has 72 divisors (see below), whose sum is σ = 5200152048. Its totient is φ = 391847040.

The previous prime is 1591880923. The next prime is 1591880951. The reversal of 1591880940 is 490881951.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 337806 + ... + 342485.

It is an arithmetic number, because the mean of its divisors is an integer number (72224334).

Almost surely, 2^1591880940 is an apocalyptic number.

1591880940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1591880940 is an abundant number, since it is smaller than the sum of its proper divisors (3608271108).

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

1591880940 is a wasteful number, since it uses less digits than its factorization.

1591880940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680319 (or 680314 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1591880940 is about 39898.3826739882. The cubic root of 1591880940 is about 1167.6253831993.

The spelling of 1591880940 in words is "one billion, five hundred ninety-one million, eight hundred eighty thousand, nine hundred forty".