1997815 has 8 divisors (see below), whose sum is σ = 2462400. Its totient is φ = 1554912.

The previous prime is 1997813. The next prime is 1997833. The reversal of 1997815 is 5187991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1997815 - 2¹ = 1997813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5215 + ... + 5584.

It is an arithmetic number, because the mean of its divisors is an integer number (307800).

2^1997815 is an apocalyptic number.

1997815 is a deficient number, since it is larger than the sum of its proper divisors (464585).

1997815 is a wasteful number, since it uses less digits than its factorization.

1997815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841.

The product of its digits is 22680, while the sum is 40.

The square root of 1997815 is about 1413.4408371064. The cubic root of 1997815 is about 125.9462061457.

The spelling of 1997815 in words is "one million, nine hundred ninety-seven thousand, eight hundred fifteen".