997720012 has 6 divisors (see below), whose sum is σ = 1746010028. Its totient is φ = 498860004.

The previous prime is 997720007. The next prime is 997720043. The reversal of 997720012 is 210027799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124714998 + ... + 124715005.

Almost surely, 2^997720012 is an apocalyptic number.

It is an amenable number.

997720012 is a deficient number, since it is larger than the sum of its proper divisors (748290016).

997720012 is a wasteful number, since it uses less digits than its factorization.

997720012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249430007 (or 249430005 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 997720012 is about 31586.7062543723. The cubic root of 997720012 is about 999.2394256734.

The spelling of 997720012 in words is "nine hundred ninety-seven million, seven hundred twenty thousand, twelve".