6407890 has 16 divisors (see below), whose sum is σ = 11816280. Its totient is φ = 2500480.

The previous prime is 6407881. The next prime is 6407893. The reversal of 6407890 is 987046.

It can be written as a sum of positive squares in 4 ways, for example, as 5574321 + 833569 = 2361^2 + 913^2 .

It is a super-2 number, since 2×6407890² = 82122108504200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6407893) by changing a digit.

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, 7405 + ... + 8224.

Almost surely, 2^6407890 is an apocalyptic number.

6407890 is a deficient number, since it is larger than the sum of its proper divisors (5408390).

6407890 is a wasteful number, since it uses less digits than its factorization.

6407890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15677.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 6407890 is about 2531.3810459905. The cubic root of 6407890 is about 185.7398181295.

The spelling of 6407890 in words is "six million, four hundred seven thousand, eight hundred ninety".