997355940 has 96 divisors (see below), whose sum is σ = 3224573184. Its totient is φ = 225607680.

The previous prime is 997355939. The next prime is 997355977. The reversal of 997355940 is 49553799.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28500 + ... + 52980.

It is an arithmetic number, because the mean of its divisors is an integer number (33589304).

Almost surely, 2^997355940 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 997355940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612286592).

997355940 is an abundant number, since it is smaller than the sum of its proper divisors (2227217244).

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

997355940 is a wasteful number, since it uses less digits than its factorization.

997355940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24597 (or 24595 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 51.

The square root of 997355940 is about 31580.9426711743. The cubic root of 997355940 is about 999.1178687399.

The spelling of 997355940 in words is "nine hundred ninety-seven million, three hundred fifty-five thousand, nine hundred forty".