394015861 has 2 divisors, whose sum is σ = 394015862. Its totient is φ = 394015860.

The previous prime is 394015819. The next prime is 394015871. The reversal of 394015861 is 168510493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372104100 + 21911761 = 19290^2 + 4681^2 .

It is a cyclic number.

It is not a de Polignac number, because 394015861 - 2⁷ = 394015733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394015861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394015871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197007930 + 197007931.

It is an arithmetic number, because the mean of its divisors is an integer number (197007931).

Almost surely, 2^394015861 is an apocalyptic number.

It is an amenable number.

394015861 is a deficient number, since it is larger than the sum of its proper divisors (1).

394015861 is an equidigital number, since it uses as much as digits as its factorization.

394015861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 394015861 is about 19849.8327700764. The cubic root of 394015861 is about 733.1135302450.

The spelling of 394015861 in words is "three hundred ninety-four million, fifteen thousand, eight hundred sixty-one".