997725397 has 8 divisors (see below), whose sum is σ = 1052638400. Its totient is φ = 943052544.

The previous prime is 997725347. The next prime is 997725401. The reversal of 997725397 is 793527799.

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-997725397 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 (997725317) 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, 51468 + ... + 68149.

It is an arithmetic number, because the mean of its divisors is an integer number (131579800).

Almost surely, 2^997725397 is an apocalyptic number.

It is an amenable number.

997725397 is a deficient number, since it is larger than the sum of its proper divisors (54913003).

997725397 is a wasteful number, since it uses less digits than its factorization.

997725397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120075.

The product of its digits is 7501410, while the sum is 58.

The square root of 997725397 is about 31586.7914958136. The cubic root of 997725397 is about 999.2412234037.

The spelling of 997725397 in words is "nine hundred ninety-seven million, seven hundred twenty-five thousand, three hundred ninety-seven".