1973813 has 2 divisors, whose sum is σ = 1973814. Its totient is φ = 1973812.

The previous prime is 1973779. The next prime is 1973821. The reversal of 1973813 is 3183791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 550564 = 1193^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973813 - 2⁶ = 1973749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1973813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1973893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986906 + 986907.

It is an arithmetic number, because the mean of its divisors is an integer number (986907).

2^1973813 is an apocalyptic number.

It is an amenable number.

1973813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973813 is an equidigital number, since it uses as much as digits as its factorization.

1973813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 1973813 is about 1404.9245531344. The cubic root of 1973813 is about 125.4397948293.

The spelling of 1973813 in words is "one million, nine hundred seventy-three thousand, eight hundred thirteen".