1591297920 has 256 divisors, whose sum is σ = 5968468800. Its totient is φ = 399310848.

The previous prime is 1591297919. The next prime is 1591297933. The reversal of 1591297920 is 297921951.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291052 + ... + 296468.

Almost surely, 2^1591297920 is an apocalyptic number.

1591297920 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 1591297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2984234400).

1591297920 is an abundant number, since it is smaller than the sum of its proper divisors (4377170880).

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

1591297920 is a wasteful number, since it uses less digits than its factorization.

1591297920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462 (or 5444 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 1591297920 is about 39891.0756936937. The cubic root of 1591297920 is about 1167.4828197580.

The spelling of 1591297920 in words is "one billion, five hundred ninety-one million, two hundred ninety-seven thousand, nine hundred twenty".