997487979 has 8 divisors (see below), whose sum is σ = 1330398672. Its totient is φ = 664784640.

The previous prime is 997487977. The next prime is 997487993. The reversal of 997487979 is 979784799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997487979 - 2¹ = 997487977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997487977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40242 + ... + 60119.

It is an arithmetic number, because the mean of its divisors is an integer number (166299834).

Almost surely, 2^997487979 is an apocalyptic number.

997487979 is a deficient number, since it is larger than the sum of its proper divisors (332910693).

997487979 is a wasteful number, since it uses less digits than its factorization.

997487979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103677.

The product of its digits is 72013536, while the sum is 69.

The square root of 997487979 is about 31583.0330874031. The cubic root of 997487979 is about 999.1619575477.

The spelling of 997487979 in words is "nine hundred ninety-seven million, four hundred eighty-seven thousand, nine hundred seventy-nine".