994423909 has 2 divisors, whose sum is σ = 994423910. Its totient is φ = 994423908.

The previous prime is 994423907. The next prime is 994423933. The reversal of 994423909 is 909324499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 927019809 + 67404100 = 30447^2 + 8210^2 .

It is a cyclic number.

It is not a de Polignac number, because 994423909 - 2¹ = 994423907 is a prime.

Together with 994423907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994423901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497211954 + 497211955.

It is an arithmetic number, because the mean of its divisors is an integer number (497211955).

Almost surely, 2^994423909 is an apocalyptic number.

It is an amenable number.

994423909 is a deficient number, since it is larger than the sum of its proper divisors (1).

994423909 is an equidigital number, since it uses as much as digits as its factorization.

994423909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 994423909 is about 31534.4876127709. The cubic root of 994423909 is about 998.1378375033.

The spelling of 994423909 in words is "nine hundred ninety-four million, four hundred twenty-three thousand, nine hundred nine".