1869997 has 4 divisors (see below), whose sum is σ = 1874880. Its totient is φ = 1865116.

The previous prime is 1869991. The next prime is 1870019. The reversal of 1869997 is 7999681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1869997 - 2¹¹ = 1867949 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1869997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813 + ... + 2650.

It is an arithmetic number, because the mean of its divisors is an integer number (468720).

2^1869997 is an apocalyptic number.

It is an amenable number.

1869997 is a deficient number, since it is larger than the sum of its proper divisors (4883).

1869997 is an equidigital number, since it uses as much as digits as its factorization.

1869997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882.

The product of its digits is 244944, while the sum is 49.

The square root of 1869997 is about 1367.4783362087. The cubic root of 1869997 is about 123.2008308329.

The spelling of 1869997 in words is "one million, eight hundred sixty-nine thousand, nine hundred ninety-seven".