997925287 has 8 divisors (see below), whose sum is σ = 1018571760. Its totient is φ = 977346240.

The previous prime is 997925273. The next prime is 997925303. The reversal of 997925287 is 782529799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997925287 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 (997925207) 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, 13612 + ... + 46702.

It is an arithmetic number, because the mean of its divisors is an integer number (127321470).

Almost surely, 2^997925287 is an apocalyptic number.

997925287 is a deficient number, since it is larger than the sum of its proper divisors (20646473).

997925287 is a wasteful number, since it uses less digits than its factorization.

997925287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33713.

The product of its digits is 5715360, while the sum is 58.

The square root of 997925287 is about 31589.9554763852. The cubic root of 997925287 is about 999.3079501775.

The spelling of 997925287 in words is "nine hundred ninety-seven million, nine hundred twenty-five thousand, two hundred eighty-seven".