997998983 has 8 divisors (see below), whose sum is σ = 1019736960. Its totient is φ = 976421880.

The previous prime is 997998973. The next prime is 997999001. The reversal of 997998983 is 389899799.

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

It is a cyclic number.

It is not a de Polignac number, because 997998983 - 2¹² = 997994887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997998913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27635 + ... + 52532.

It is an arithmetic number, because the mean of its divisors is an integer number (127467120).

Almost surely, 2^997998983 is an apocalyptic number.

997998983 is a deficient number, since it is larger than the sum of its proper divisors (21737977).

997998983 is a wasteful number, since it uses less digits than its factorization.

997998983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80437.

The product of its digits is 79361856, while the sum is 71.

The square root of 997998983 is about 31591.1219015723. The cubic root of 997998983 is about 999.3325489415.

The spelling of 997998983 in words is "nine hundred ninety-seven million, nine hundred ninety-eight thousand, nine hundred eighty-three".