1591245440 has 64 divisors (see below), whose sum is σ = 4004316000. Its totient is φ = 602993664.

The previous prime is 1591245433. The next prime is 1591245443. The reversal of 1591245440 is 445421951.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 1591245440.

It is not an unprimeable number, because it can be changed into a prime (1591245443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53270 + ... + 77589.

Almost surely, 2^1591245440 is an apocalyptic number.

1591245440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1591245440 is an abundant number, since it is smaller than the sum of its proper divisors (2413070560).

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

1591245440 is a wasteful number, since it uses less digits than its factorization.

1591245440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130897 (or 130885 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1591245440 is about 39890.4178970339. The cubic root of 1591245440 is about 1167.4699853350.

The spelling of 1591245440 in words is "one billion, five hundred ninety-one million, two hundred forty-five thousand, four hundred forty".