6442906 has 4 divisors (see below), whose sum is σ = 9664362. Its totient is φ = 3221452.

The previous prime is 6442897. The next prime is 6442937. The reversal of 6442906 is 6092446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5359225 + 1083681 = 2315^2 + 1041^2 .

It is a super-2 number, since 2×6442906² = 83022075449672, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610725 + ... + 1610728.

Almost surely, 2^6442906 is an apocalyptic number.

6442906 is a deficient number, since it is larger than the sum of its proper divisors (3221456).

6442906 is a wasteful number, since it uses less digits than its factorization.

6442906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221455.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 6442906 is about 2538.2880057235. The cubic root of 6442906 is about 186.0775296324.

The spelling of 6442906 in words is "six million, four hundred forty-two thousand, nine hundred six".