402778279 has 2 divisors, whose sum is σ = 402778280. Its totient is φ = 402778278.

The previous prime is 402778267. The next prime is 402778349. The reversal of 402778279 is 972877204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402778279 - 2¹³ = 402770087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402778249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201389139 + 201389140.

It is an arithmetic number, because the mean of its divisors is an integer number (201389140).

Almost surely, 2^402778279 is an apocalyptic number.

402778279 is a deficient number, since it is larger than the sum of its proper divisors (1).

402778279 is an equidigital number, since it uses as much as digits as its factorization.

402778279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 402778279 is about 20069.3367852553. The cubic root of 402778279 is about 738.5082432853.

The spelling of 402778279 in words is "four hundred two million, seven hundred seventy-eight thousand, two hundred seventy-nine".