997890597 has 40 divisors (see below), whose sum is σ = 1637182272. Its totient is φ = 600696000.

The previous prime is 997890559. The next prime is 997890613. The reversal of 997890597 is 795098799.

It is not a de Polignac number, because 997890597 - 2¹⁶ = 997825061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997890547) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 130833 + ... + 138249.

Almost surely, 2^997890597 is an apocalyptic number.

It is an amenable number.

997890597 is a deficient number, since it is larger than the sum of its proper divisors (639291675).

997890597 is a wasteful number, since it uses less digits than its factorization.

997890597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7591 (or 7582 counting only the distinct ones).

The product of its (nonzero) digits is 12859560, while the sum is 63.

The square root of 997890597 is about 31589.4064046794. The cubic root of 997890597 is about 999.2963706886.

The spelling of 997890597 in words is "nine hundred ninety-seven million, eight hundred ninety thousand, five hundred ninety-seven".