997279785 has 12 divisors (see below), whose sum is σ = 1728618372. Its totient is φ = 531882528.

The previous prime is 997279769. The next prime is 997279807. The reversal of 997279785 is 587972799.

It can be written as a sum of positive squares in 2 ways, for example, as 337971456 + 659308329 = 18384^2 + 25677^2 .

It is not a de Polignac number, because 997279785 - 2⁴ = 997279769 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11080842 + ... + 11080931.

It is an arithmetic number, because the mean of its divisors is an integer number (144051531).

Almost surely, 2^997279785 is an apocalyptic number.

It is an amenable number.

997279785 is a deficient number, since it is larger than the sum of its proper divisors (731338587).

997279785 is a wasteful number, since it uses less digits than its factorization.

997279785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22161784 (or 22161781 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 63.

The square root of 997279785 is about 31579.7369368397. The cubic root of 997279785 is about 999.0924382475.

The spelling of 997279785 in words is "nine hundred ninety-seven million, two hundred seventy-nine thousand, seven hundred eighty-five".