394648057 has 2 divisors, whose sum is σ = 394648058. Its totient is φ = 394648056.

The previous prime is 394648043. The next prime is 394648061. The reversal of 394648057 is 750846493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247244176 + 147403881 = 15724^2 + 12141^2 .

It is a cyclic number.

It is not a de Polignac number, because 394648057 - 2¹¹ = 394646009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394647998 and 394648016.

It is not a weakly prime, because it can be changed into another prime (394648027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197324028 + 197324029.

It is an arithmetic number, because the mean of its divisors is an integer number (197324029).

Almost surely, 2^394648057 is an apocalyptic number.

It is an amenable number.

394648057 is a deficient number, since it is larger than the sum of its proper divisors (1).

394648057 is an equidigital number, since it uses as much as digits as its factorization.

394648057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 394648057 is about 19865.7508541711. The cubic root of 394648057 is about 733.5054127628.

It can be divided in two parts, 3946 and 48057, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 394648057 in words is "three hundred ninety-four million, six hundred forty-eight thousand, fifty-seven".