6667994 has 16 divisors (see below), whose sum is σ = 10319400. Its totient is φ = 3229440.

The previous prime is 6667981. The next prime is 6668021. The reversal of 6667994 is 4997666.

It can be written as a sum of positive squares in 4 ways, for example, as 3822025 + 2845969 = 1955^2 + 1687^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18932 + ... + 19280.

Almost surely, 2^6667994 is an apocalyptic number.

6667994 is a deficient number, since it is larger than the sum of its proper divisors (3651406).

6667994 is a wasteful number, since it uses less digits than its factorization.

6667994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625.

The product of its digits is 489888, while the sum is 47.

The square root of 6667994 is about 2582.2459216736. The cubic root of 6667994 is about 188.2196956322.

The spelling of 6667994 in words is "six million, six hundred sixty-seven thousand, nine hundred ninety-four".