1997830 has 8 divisors (see below), whose sum is σ = 3596112. Its totient is φ = 799128.

The previous prime is 1997813. The next prime is 1997833. The reversal of 1997830 is 387991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1997830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997833) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 99882 + ... + 99901.

It is an arithmetic number, because the mean of its divisors is an integer number (449514).

2^1997830 is an apocalyptic number.

1997830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997830 is a deficient number, since it is larger than the sum of its proper divisors (1598282).

1997830 is a wasteful number, since it uses less digits than its factorization.

1997830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199790.

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

The square root of 1997830 is about 1413.4461432966. The cubic root of 1997830 is about 125.9465213548.

The spelling of 1997830 in words is "one million, nine hundred ninety-seven thousand, eight hundred thirty".