6447942 has 12 divisors (see below), whose sum is σ = 13970580. Its totient is φ = 2149308.

The previous prime is 6447929. The next prime is 6447943. The reversal of 6447942 is 2497446.

6447942 is a `hidden beast` number, since 644 + 7 + 9 + 4 + 2 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6447897 and 6447906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 179092 + ... + 179127.

It is an arithmetic number, because the mean of its divisors is an integer number (1164215).

Almost surely, 2^6447942 is an apocalyptic number.

6447942 is an abundant number, since it is smaller than the sum of its proper divisors (7522638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6447942 is a wasteful number, since it uses less digits than its factorization.

6447942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358227 (or 358224 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 6447942 is about 2539.2798191613. The cubic root of 6447942 is about 186.1259985682.

The spelling of 6447942 in words is "six million, four hundred forty-seven thousand, nine hundred forty-two".