394430237 has 2 divisors, whose sum is σ = 394430238. Its totient is φ = 394430236.

The previous prime is 394430221. The next prime is 394430279. The reversal of 394430237 is 732034493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393189241 + 1240996 = 19829^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 394430237 - 2⁴ = 394430221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394430197 and 394430206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394430297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197215118 + 197215119.

It is an arithmetic number, because the mean of its divisors is an integer number (197215119).

Almost surely, 2^394430237 is an apocalyptic number.

It is an amenable number.

394430237 is a deficient number, since it is larger than the sum of its proper divisors (1).

394430237 is an equidigital number, since it uses as much as digits as its factorization.

394430237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 35.

The square root of 394430237 is about 19860.2677977917. The cubic root of 394430237 is about 733.3704388709.

The spelling of 394430237 in words is "three hundred ninety-four million, four hundred thirty thousand, two hundred thirty-seven".