1997380 has 48 divisors (see below), whose sum is σ = 5233536. Its totient is φ = 622080.

The previous prime is 1997351. The next prime is 1997407. The reversal of 1997380 is 837991.

1997380 = 105² + 106² + ... + 192².

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (109032).

2^1997380 is an apocalyptic number.

1997380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2616768).

1997380 is an abundant number, since it is smaller than the sum of its proper divisors (3236156).

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

1997380 is a wasteful number, since it uses less digits than its factorization.

1997380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1997380 is about 1413.2869489244. The cubic root of 1997380 is about 125.9370643956.

The spelling of 1997380 in words is "one million, nine hundred ninety-seven thousand, three hundred eighty".