997905474 has 64 divisors (see below), whose sum is σ = 2380337280. Its totient is φ = 308759040.

The previous prime is 997905473. The next prime is 997905499. The reversal of 997905474 is 474509799.

997905474 is a `hidden beast` number, since 9 + 9 + 7 + 90 + 547 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 997905474.

It is not an unprimeable number, because it can be changed into a prime (997905473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59569 + ... + 74459.

It is an arithmetic number, because the mean of its divisors is an integer number (37192770).

Almost surely, 2^997905474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997905474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190168640).

997905474 is an abundant number, since it is smaller than the sum of its proper divisors (1382431806).

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

997905474 is a wasteful number, since it uses less digits than its factorization.

997905474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992 (or 14986 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 997905474 is about 31589.6418783119. The cubic root of 997905474 is about 999.3013366499.

The spelling of 997905474 in words is "nine hundred ninety-seven million, nine hundred five thousand, four hundred seventy-four".