997747146 has 160 divisors (see below), whose sum is σ = 2587464000. Its totient is φ = 284497920.

The previous prime is 997747129. The next prime is 997747151. The reversal of 997747146 is 641747799.

It is a super-2 number, since 2×997747146² = 1990998734702290632, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 997747092 and 997747101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2221930 + ... + 2222378.

It is an arithmetic number, because the mean of its divisors is an integer number (16171650).

Almost surely, 2^997747146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997747146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293732000).

997747146 is an abundant number, since it is smaller than the sum of its proper divisors (1589716854).

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

997747146 is a wasteful number, since it uses less digits than its factorization.

997747146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 537 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 997747146 is about 31587.1357675874. The cubic root of 997747146 is about 999.2484840319.

The spelling of 997747146 in words is "nine hundred ninety-seven million, seven hundred forty-seven thousand, one hundred forty-six".