1997790 has 16 divisors (see below), whose sum is σ = 4794768. Its totient is φ = 532736.

The previous prime is 1997773. The next prime is 1997813. The reversal of 1997790 is 977991.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33267 + ... + 33326.

It is an arithmetic number, because the mean of its divisors is an integer number (299673).

2^1997790 is an apocalyptic number.

1997790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997790 is an abundant number, since it is smaller than the sum of its proper divisors (2796978).

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

1997790 is a wasteful number, since it uses less digits than its factorization.

1997790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66603.

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 1997790 is about 1413.4319934118. The cubic root of 1997790 is about 125.9456807937.

The spelling of 1997790 in words is "one million, nine hundred ninety-seven thousand, seven hundred ninety".