1597637140 has 96 divisors (see below), whose sum is σ = 3720019968. Its totient is φ = 571536000.

The previous prime is 1597637099. The next prime is 1597637147. The reversal of 1597637140 is 417367951.

It is a super-2 number, since 2×1597637140² = 5104888862214759200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597637147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5895205 + ... + 5895475.

It is an arithmetic number, because the mean of its divisors is an integer number (38750208).

Almost surely, 2^1597637140 is an apocalyptic number.

1597637140 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 1597637140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1860009984).

1597637140 is an abundant number, since it is smaller than the sum of its proper divisors (2122382828).

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

1597637140 is a wasteful number, since it uses less digits than its factorization.

1597637140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 1597637140 is about 39970.4533374341. The cubic root of 1597637140 is about 1169.0310579177.

The spelling of 1597637140 in words is "one billion, five hundred ninety-seven million, six hundred thirty-seven thousand, one hundred forty".