1597980397 has 6 divisors (see below), whose sum is σ = 1721057198. Its totient is φ = 1474925784.

The previous prime is 1597980379. The next prime is 1597980409. The reversal of 1597980397 is 7930897951.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1106294121 + 491686276 = 33261^2 + 22174^2 .

It is not a de Polignac number, because 1597980397 - 2¹⁹ = 1597456109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597980317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138588 + ... + 149674.

Almost surely, 2^1597980397 is an apocalyptic number.

It is an amenable number.

1597980397 is a deficient number, since it is larger than the sum of its proper divisors (123076801).

1597980397 is an frugal number, since it uses more digits than its factorization.

1597980397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22187 (or 11100 counting only the distinct ones).

The product of its (nonzero) digits is 4286520, while the sum is 58.

The square root of 1597980397 is about 39974.7469910692. The cubic root of 1597980397 is about 1169.1147751667.

The spelling of 1597980397 in words is "one billion, five hundred ninety-seven million, nine hundred eighty thousand, three hundred ninety-seven".