394975877 has 2 divisors, whose sum is σ = 394975878. Its totient is φ = 394975876.

The previous prime is 394975843. The next prime is 394975879. The reversal of 394975877 is 778579493.

It is a Cunningham number, because it is equal to 19874²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394975876 + 1 = 19874^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 394975877 - 2⁶ = 394975813 is a prime.

Together with 394975879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394975879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197487938 + 197487939.

It is an arithmetic number, because the mean of its divisors is an integer number (197487939).

Almost surely, 2^394975877 is an apocalyptic number.

It is an amenable number.

394975877 is a deficient number, since it is larger than the sum of its proper divisors (1).

394975877 is an equidigital number, since it uses as much as digits as its factorization.

394975877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 59.

The square root of 394975877 is about 19874.0000251585. Note that the first 4 decimals coincide. The cubic root of 394975877 is about 733.7084554410.

The spelling of 394975877 in words is "three hundred ninety-four million, nine hundred seventy-five thousand, eight hundred seventy-seven".