1994840213 has 4 divisors (see below), whose sum is σ = 1996374828. Its totient is φ = 1993305600.

The previous prime is 1994840203. The next prime is 1994840249. The reversal of 1994840213 is 3120484991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2289169 + 1992551044 = 1513^2 + 44638^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994840213 - 2³⁰ = 921098389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994840203) 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, 765356 + ... + 767957.

It is an arithmetic number, because the mean of its divisors is an integer number (499093707).

Almost surely, 2^1994840213 is an apocalyptic number.

It is an amenable number.

1994840213 is a deficient number, since it is larger than the sum of its proper divisors (1534615).

1994840213 is a wasteful number, since it uses less digits than its factorization.

1994840213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534614.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1994840213 is about 44663.6341221804. The cubic root of 1994840213 is about 1258.8366294207.

The spelling of 1994840213 in words is "one billion, nine hundred ninety-four million, eight hundred forty thousand, two hundred thirteen".