402778324 has 24 divisors (see below), whose sum is σ = 759666600. Its totient is φ = 185754624.

The previous prime is 402778279. The next prime is 402778349. The reversal of 402778324 is 423877204.

It can be written as a sum of positive squares in 4 ways, for example, as 29052100 + 373726224 = 5390^2 + 19332^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97452 + ... + 101500.

It is an arithmetic number, because the mean of its divisors is an integer number (31652775).

Almost surely, 2^402778324 is an apocalyptic number.

It is an amenable number.

402778324 is a deficient number, since it is larger than the sum of its proper divisors (356888276).

402778324 is a wasteful number, since it uses less digits than its factorization.

402778324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5979 (or 5977 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 402778324 is about 20069.3379063685. The cubic root of 402778324 is about 738.5082707883.

The spelling of 402778324 in words is "four hundred two million, seven hundred seventy-eight thousand, three hundred twenty-four".