997749 has 12 divisors (see below), whose sum is σ = 1466400. Its totient is φ = 653544.

The previous prime is 997741. The next prime is 997751. The reversal of 997749 is 947799.

It is not a de Polignac number, because 997749 - 2³ = 997741 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409 + ... + 1470.

It is an arithmetic number, because the mean of its divisors is an integer number (122200).

2⁹⁹⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

997749 is a deficient number, since it is larger than the sum of its proper divisors (468651).

997749 is a wasteful number, since it uses less digits than its factorization.

997749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944 (or 1941 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 997749 is about 998.8738659110. The cubic root of 997749 is about 99.9249102961.

The spelling of 997749 in words is "nine hundred ninety-seven thousand, seven hundred forty-nine".