6690381 has 16 divisors (see below), whose sum is σ = 9153984. Its totient is φ = 4345344.

The previous prime is 6690379. The next prime is 6690427. The reversal of 6690381 is 1830966.

6690381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6690381 - 2¹ = 6690379 is a prime.

It is a super-2 number, since 2×6690381² = 89522395850322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690331) 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 15 ways as a sum of consecutive naturals, for example, 24015 + ... + 24291.

It is an arithmetic number, because the mean of its divisors is an integer number (572124).

Almost surely, 2^6690381 is an apocalyptic number.

It is an amenable number.

6690381 is a deficient number, since it is larger than the sum of its proper divisors (2463603).

6690381 is a wasteful number, since it uses less digits than its factorization.

6690381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 6690381 is about 2586.5770817820. The cubic root of 6690381 is about 188.4301021135.

The spelling of 6690381 in words is "six million, six hundred ninety thousand, three hundred eighty-one".