1997580 has 72 divisors (see below), whose sum is σ = 6087312. Its totient is φ = 489216.

The previous prime is 1997557. The next prime is 1997587. The reversal of 1997580 is 857991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1997587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10042 + ... + 10238.

It is an arithmetic number, because the mean of its divisors is an integer number (84546).

2^1997580 is an apocalyptic number.

1997580 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 1997580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3043656).

1997580 is an abundant number, since it is smaller than the sum of its proper divisors (4089732).

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

1997580 is a wasteful number, since it uses less digits than its factorization.

1997580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 1997580 is about 1413.3577041924. The cubic root of 1997580 is about 125.9412676639.

The spelling of 1997580 in words is "one million, nine hundred ninety-seven thousand, five hundred eighty".