402439682 has 8 divisors (see below), whose sum is σ = 618383052. Its totient is φ = 196312000.

The previous prime is 402439673. The next prime is 402439747. The reversal of 402439682 is 286934204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 378341401 + 24098281 = 19451^2 + 4909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×402439682² = 323915395296522248, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2453819 + ... + 2453982.

Almost surely, 2^402439682 is an apocalyptic number.

402439682 is a deficient number, since it is larger than the sum of its proper divisors (215943370).

402439682 is a wasteful number, since it uses less digits than its factorization.

402439682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907844.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 402439682 is about 20060.8993317847. The cubic root of 402439682 is about 738.3012420708.

The spelling of 402439682 in words is "four hundred two million, four hundred thirty-nine thousand, six hundred eighty-two".