6990440 has 16 divisors (see below), whose sum is σ = 15728580. Its totient is φ = 2796160.

The previous prime is 6990439. The next prime is 6990463. The reversal of 6990440 is 440996.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6041764 + 948676 = 2458^2 + 974^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6990397 and 6990406.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 87341 + ... + 87420.

Almost surely, 2^6990440 is an apocalyptic number.

It is an amenable number.

6990440 is an abundant number, since it is smaller than the sum of its proper divisors (8738140).

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

6990440 is a wasteful number, since it uses less digits than its factorization.

6990440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174772 (or 174768 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6990440 is about 2643.9440236132. The cubic root of 6990440 is about 191.2059946884.

It can be divided in two parts, 69 and 90440, that added together give a palindrome (90509).

The spelling of 6990440 in words is "six million, nine hundred ninety thousand, four hundred forty".