997072146 has 128 divisors (see below), whose sum is σ = 2604648960. Its totient is φ = 276846336.

The previous prime is 997072129. The next prime is 997072157. The reversal of 997072146 is 641270799.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3145180 + ... + 3145496.

It is an arithmetic number, because the mean of its divisors is an integer number (20348820).

Almost surely, 2^997072146 is an apocalyptic number.

997072146 is the 19971-st heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997072146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1302324480).

997072146 is an abundant number, since it is smaller than the sum of its proper divisors (1607576814).

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

997072146 is a wasteful number, since it uses less digits than its factorization.

997072146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 997072146 is about 31576.4492303995. The cubic root of 997072146 is about 999.0230946333.

The spelling of 997072146 in words is "nine hundred ninety-seven million, seventy-two thousand, one hundred forty-six".