6931990 has 16 divisors (see below), whose sum is σ = 13437648. Its totient is φ = 2559456.

The previous prime is 6931961. The next prime is 6931997. The reversal of 6931990 is 991396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6931997) 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 7 ways as a sum of consecutive naturals, for example, 26532 + ... + 26791.

It is an arithmetic number, because the mean of its divisors is an integer number (839853).

Almost surely, 2^6931990 is an apocalyptic number.

6931990 is a deficient number, since it is larger than the sum of its proper divisors (6505658).

6931990 is a wasteful number, since it uses less digits than its factorization.

6931990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53343.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 6931990 is about 2632.8672583326. The cubic root of 6931990 is about 190.6715846016.

It can be divided in two parts, 6931 and 990, that added together give a square (7921 = 89²).

The spelling of 6931990 in words is "six million, nine hundred thirty-one thousand, nine hundred ninety".