997745 has 16 divisors (see below), whose sum is σ = 1416960. Its totient is φ = 659904.

The previous prime is 997741. The next prime is 997751. The reversal of 997745 is 547799.

It is a happy number.

It is not a de Polignac number, because 997745 - 2² = 997741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524 + ... + 1506.

It is an arithmetic number, because the mean of its divisors is an integer number (88560).

2⁹⁹⁷⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

997745 is a deficient number, since it is larger than the sum of its proper divisors (419215).

997745 is a wasteful number, since it uses less digits than its factorization.

997745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 79380, while the sum is 41.

The square root of 997745 is about 998.8718636542. The cubic root of 997745 is about 99.9247767622.

The spelling of 997745 in words is "nine hundred ninety-seven thousand, seven hundred forty-five".