997982757 has 24 divisors (see below), whose sum is σ = 1453181184. Its totient is φ = 659968704.

The previous prime is 997982669. The next prime is 997982837. The reversal of 997982757 is 757289799.

It is not a de Polignac number, because 997982757 - 2¹⁴ = 997966373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997982694 and 997982703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997982057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 695713 + ... + 697145.

It is an arithmetic number, because the mean of its divisors is an integer number (60549216).

Almost surely, 2^997982757 is an apocalyptic number.

997982757 is the 25794-th pentagonal number.

It is an amenable number.

997982757 is a deficient number, since it is larger than the sum of its proper divisors (455198427).

997982757 is a wasteful number, since it uses less digits than its factorization.

997982757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2006 counting only the distinct ones).

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

The square root of 997982757 is about 31590.8650878699. The cubic root of 997982757 is about 999.3271330182.

The spelling of 997982757 in words is "nine hundred ninety-seven million, nine hundred eighty-two thousand, seven hundred fifty-seven".