997939136 has 56 divisors (see below), whose sum is σ = 2049968976. Its totient is φ = 481628160.

The previous prime is 997939123. The next prime is 997939169. The reversal of 997939136 is 631939799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308600 + ... + 311816.

Almost surely, 2^997939136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997939136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024984488).

997939136 is an abundant number, since it is smaller than the sum of its proper divisors (1052029840).

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

997939136 is a wasteful number, since it uses less digits than its factorization.

997939136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3387 counting only the distinct ones).

The product of its digits is 2480058, while the sum is 56.

The square root of 997939136 is about 31590.1746750473. The cubic root of 997939136 is about 999.3125728856.

The spelling of 997939136 in words is "nine hundred ninety-seven million, nine hundred thirty-nine thousand, one hundred thirty-six".