1994830421 has 2 divisors, whose sum is σ = 1994830422. Its totient is φ = 1994830420.

The previous prime is 1994830417. The next prime is 1994830423. The reversal of 1994830421 is 1240384991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1896602500 + 98227921 = 43550^2 + 9911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994830421 - 2² = 1994830417 is a prime.

Together with 1994830423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994830423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997415210 + 997415211.

It is an arithmetic number, because the mean of its divisors is an integer number (997415211).

Almost surely, 2^1994830421 is an apocalyptic number.

It is an amenable number.

1994830421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994830421 is an equidigital number, since it uses as much as digits as its factorization.

1994830421 is an evil number, because the sum of its binary digits is even.

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

The square root of 1994830421 is about 44663.5245026632. The cubic root of 1994830421 is about 1258.8345696821.

The spelling of 1994830421 in words is "one billion, nine hundred ninety-four million, eight hundred thirty thousand, four hundred twenty-one".