394149589 has 2 divisors, whose sum is σ = 394149590. Its totient is φ = 394149588.

The previous prime is 394149541. The next prime is 394149629. The reversal of 394149589 is 985941493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236144689 + 158004900 = 15367^2 + 12570^2 .

It is a cyclic number.

It is not a de Polignac number, because 394149589 - 2¹¹ = 394147541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394149089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197074794 + 197074795.

It is an arithmetic number, because the mean of its divisors is an integer number (197074795).

Almost surely, 2^394149589 is an apocalyptic number.

It is an amenable number.

394149589 is a deficient number, since it is larger than the sum of its proper divisors (1).

394149589 is an equidigital number, since it uses as much as digits as its factorization.

394149589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The square root of 394149589 is about 19853.2009761650. The cubic root of 394149589 is about 733.1964598312.

The spelling of 394149589 in words is "three hundred ninety-four million, one hundred forty-nine thousand, five hundred eighty-nine".