6406490 has 8 divisors (see below), whose sum is σ = 11531700. Its totient is φ = 2562592.

The previous prime is 6406483. The next prime is 6406493. The reversal of 6406490 is 946046.

It can be written as a sum of positive squares in 2 ways, for example, as 6405961 + 529 = 2531^2 + 23^2 .

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

It is a super-2 number, since 2×6406490² = 82086228240200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6406493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320315 + ... + 320334.

Almost surely, 2^6406490 is an apocalyptic number.

6406490 is a deficient number, since it is larger than the sum of its proper divisors (5125210).

6406490 is a wasteful number, since it uses less digits than its factorization.

6406490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640656.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6406490 is about 2531.1045019912. The cubic root of 6406490 is about 185.7262902919.

The spelling of 6406490 in words is "six million, four hundred six thousand, four hundred ninety".