6406402 has 8 divisors (see below), whose sum is σ = 9869436. Its totient is φ = 3116592.

The previous prime is 6406381. The next prime is 6406427. The reversal of 6406402 is 2046046.

It can be written as a sum of positive squares in 2 ways, for example, as 6405961 + 441 = 2531^2 + 21^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43213 + ... + 43360.

Almost surely, 2^6406402 is an apocalyptic number.

6406402 is a deficient number, since it is larger than the sum of its proper divisors (3463034).

6406402 is a wasteful number, since it uses less digits than its factorization.

6406402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86612.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 6406402 is about 2531.0871182162. The cubic root of 6406402 is about 185.7254399049.

The spelling of 6406402 in words is "six million, four hundred six thousand, four hundred two".