394904761 has 2 divisors, whose sum is σ = 394904762. Its totient is φ = 394904760.

The previous prime is 394904701. The next prime is 394904771. The reversal of 394904761 is 167409493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393625600 + 1279161 = 19840^2 + 1131^2 .

It is an emirp because it is prime and its reverse (167409493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394904761 - 2⁹ = 394904249 is a prime.

It is not a weakly prime, because it can be changed into another prime (394904701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197452380 + 197452381.

It is an arithmetic number, because the mean of its divisors is an integer number (197452381).

Almost surely, 2^394904761 is an apocalyptic number.

It is an amenable number.

394904761 is a deficient number, since it is larger than the sum of its proper divisors (1).

394904761 is an equidigital number, since it uses as much as digits as its factorization.

394904761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 394904761 is about 19872.2107728355. The cubic root of 394904761 is about 733.6644176947.

The spelling of 394904761 in words is "three hundred ninety-four million, nine hundred four thousand, seven hundred sixty-one".