999997398 has 24 divisors (see below), whose sum is σ = 2280696600. Its totient is φ = 315788544.

The previous prime is 999997357. The next prime is 999997403. The reversal of 999997398 is 893799999.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1461643 + ... + 1462326.

It is an arithmetic number, because the mean of its divisors is an integer number (95029025).

Almost surely, 2^999997398 is an apocalyptic number.

999997398 is an abundant number, since it is smaller than the sum of its proper divisors (1280699202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999997398 is a wasteful number, since it uses less digits than its factorization.

999997398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923996 (or 2923993 counting only the distinct ones).

The product of its digits is 89282088, while the sum is 72.

The square root of 999997398 is about 31622.7354604247. The cubic root of 999997398 is about 999.9991326659. Note that the first 3 decimals are identical.

The spelling of 999997398 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, three hundred ninety-eight".