1994407213 has 2 divisors, whose sum is σ = 1994407214. Its totient is φ = 1994407212.

The previous prime is 1994407199. The next prime is 1994407271. The reversal of 1994407213 is 3127044991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1024832169 + 969575044 = 32013^2 + 31138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994407213 - 2¹³ = 1994399021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994404213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997203606 + 997203607.

It is an arithmetic number, because the mean of its divisors is an integer number (997203607).

Almost surely, 2^1994407213 is an apocalyptic number.

It is an amenable number.

1994407213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994407213 is an equidigital number, since it uses as much as digits as its factorization.

1994407213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1994407213 is about 44658.7865150857. The cubic root of 1994407213 is about 1258.7455418071.

The spelling of 1994407213 in words is "one billion, nine hundred ninety-four million, four hundred seven thousand, two hundred thirteen".