1941997 has 4 divisors (see below), whose sum is σ = 1945980. Its totient is φ = 1938016.

The previous prime is 1941983. The next prime is 1942001. The reversal of 1941997 is 7991491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7991491 = 59 ⋅135449.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 799236 = 1069^2 + 894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1941997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1941937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1138 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (486495).

2^1941997 is an apocalyptic number.

1941997 is the 1138-th pentagonal number.

It is an amenable number.

1941997 is a deficient number, since it is larger than the sum of its proper divisors (3983).

1941997 is an equidigital number, since it uses as much as digits as its factorization.

1941997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982.

The product of its digits is 20412, while the sum is 40.

The square root of 1941997 is about 1393.5555245486. Note that the first 4 decimals coincide. The cubic root of 1941997 is about 124.7621503742.

The spelling of 1941997 in words is "one million, nine hundred forty-one thousand, nine hundred ninety-seven".