997986764 has 6 divisors (see below), whose sum is σ = 1746476844. Its totient is φ = 498993380.

The previous prime is 997986763. The next prime is 997986811. The reversal of 997986764 is 467689799.

It is a super-2 number, since 2×997986764² = 1991955162238383392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 997986764.

It is not an unprimeable number, because it can be changed into a prime (997986763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124748342 + ... + 124748349.

It is an arithmetic number, because the mean of its divisors is an integer number (291079474).

Almost surely, 2^997986764 is an apocalyptic number.

It is an amenable number.

997986764 is a deficient number, since it is larger than the sum of its proper divisors (748490080).

997986764 is a wasteful number, since it uses less digits than its factorization.

997986764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249496695 (or 249496693 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 65.

The square root of 997986764 is about 31590.9285080385. The cubic root of 997986764 is about 999.3284704824.

The spelling of 997986764 in words is "nine hundred ninety-seven million, nine hundred eighty-six thousand, seven hundred sixty-four".