997899994 has 48 divisors (see below), whose sum is σ = 1880850888. Its totient is φ = 393579648.

The previous prime is 997899977. The next prime is 997899997. The reversal of 997899994 is 499998799.

It can be written as a sum of positive squares in 4 ways, for example, as 629759025 + 368140969 = 25095^2 + 19187^2 .

It is not an unprimeable number, because it can be changed into a prime (997899997) 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, 504792 + ... + 506764.

Almost surely, 2^997899994 is an apocalyptic number.

997899994 is a deficient number, since it is larger than the sum of its proper divisors (882950894).

997899994 is a wasteful number, since it uses less digits than its factorization.

997899994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399 (or 2392 counting only the distinct ones).

The product of its digits is 119042784, while the sum is 73.

The square root of 997899994 is about 31589.5551409006. Note that the first 3 decimals coincide. The cubic root of 997899994 is about 999.2995074247.

The spelling of 997899994 in words is "nine hundred ninety-seven million, eight hundred ninety-nine thousand, nine hundred ninety-four".