394290137 has 2 divisors, whose sum is σ = 394290138. Its totient is φ = 394290136.

The previous prime is 394290103. The next prime is 394290151. The reversal of 394290137 is 731092493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278856601 + 115433536 = 16699^2 + 10744^2 .

It is a cyclic number.

It is not a de Polignac number, because 394290137 - 2¹⁰ = 394289113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394290137.

It is not a weakly prime, because it can be changed into another prime (394290157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197145068 + 197145069.

It is an arithmetic number, because the mean of its divisors is an integer number (197145069).

Almost surely, 2^394290137 is an apocalyptic number.

It is an amenable number.

394290137 is a deficient number, since it is larger than the sum of its proper divisors (1).

394290137 is an equidigital number, since it uses as much as digits as its factorization.

394290137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 394290137 is about 19856.7403417580. The cubic root of 394290137 is about 733.2835985325.

The spelling of 394290137 in words is "three hundred ninety-four million, two hundred ninety thousand, one hundred thirty-seven".