402778267 has 2 divisors, whose sum is σ = 402778268. Its totient is φ = 402778266.

The previous prime is 402778249. The next prime is 402778279. The reversal of 402778267 is 762877204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402778267 - 2¹¹ = 402776219 is a prime.

It is not a weakly prime, because it can be changed into another prime (402778867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201389133 + 201389134.

It is an arithmetic number, because the mean of its divisors is an integer number (201389134).

Almost surely, 2^402778267 is an apocalyptic number.

402778267 is a deficient number, since it is larger than the sum of its proper divisors (1).

402778267 is an equidigital number, since it uses as much as digits as its factorization.

402778267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 263424, while the sum is 43.

The square root of 402778267 is about 20069.3364862917. The cubic root of 402778267 is about 738.5082359512.

The spelling of 402778267 in words is "four hundred two million, seven hundred seventy-eight thousand, two hundred sixty-seven".