6691407 has 4 divisors (see below), whose sum is σ = 8921880. Its totient is φ = 4460936.

The previous prime is 6691403. The next prime is 6691411. The reversal of 6691407 is 7041966.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (6691403) and next prime (6691411).

It is a cyclic number.

It is not a de Polignac number, because 6691407 - 2² = 6691403 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691403) 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, 1115232 + ... + 1115237.

It is an arithmetic number, because the mean of its divisors is an integer number (2230470).

Almost surely, 2^6691407 is an apocalyptic number.

6691407 is a deficient number, since it is larger than the sum of its proper divisors (2230473).

6691407 is a wasteful number, since it uses less digits than its factorization.

6691407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230472.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 6691407 is about 2586.7754057900. The cubic root of 6691407 is about 188.4397338222.

The spelling of 6691407 in words is "six million, six hundred ninety-one thousand, four hundred seven".