402778323 has 24 divisors (see below), whose sum is σ = 618557472. Its totient is φ = 251991168.

The previous prime is 402778279. The next prime is 402778349. The reversal of 402778323 is 323877204.

It is not a de Polignac number, because 402778323 - 2¹³ = 402770131 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (402778373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7386 + ... + 29327.

It is an arithmetic number, because the mean of its divisors is an integer number (25773228).

Almost surely, 2^402778323 is an apocalyptic number.

402778323 is a deficient number, since it is larger than the sum of its proper divisors (215779149).

402778323 is a wasteful number, since it uses less digits than its factorization.

402778323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36795 (or 36792 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 402778323 is about 20069.3378814549. The cubic root of 402778323 is about 738.5082701772.

The spelling of 402778323 in words is "four hundred two million, seven hundred seventy-eight thousand, three hundred twenty-three".