394191383 has 2 divisors, whose sum is σ = 394191384. Its totient is φ = 394191382.

The previous prime is 394191353. The next prime is 394191439. The reversal of 394191383 is 383191493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394191383 - 2¹⁴ = 394174999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394191383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394191323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197095691 + 197095692.

It is an arithmetic number, because the mean of its divisors is an integer number (197095692).

Almost surely, 2^394191383 is an apocalyptic number.

394191383 is a deficient number, since it is larger than the sum of its proper divisors (1).

394191383 is an equidigital number, since it uses as much as digits as its factorization.

394191383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 394191383 is about 19854.2535241192. The cubic root of 394191383 is about 733.2223739602. Note that the first 3 decimals are identical.

The spelling of 394191383 in words is "three hundred ninety-four million, one hundred ninety-one thousand, three hundred eighty-three".