6990390 has 96 divisors (see below), whose sum is σ = 20756736. Its totient is φ = 1615680.

The previous prime is 6990371. The next prime is 6990419. The reversal of 6990390 is 930996.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22617 + ... + 22923.

It is an arithmetic number, because the mean of its divisors is an integer number (216216).

Almost surely, 2^6990390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6990390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10378368).

6990390 is an abundant number, since it is smaller than the sum of its proper divisors (13766346).

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

6990390 is a wasteful number, since it uses less digits than its factorization.

6990390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 6990390 is about 2643.9345680255. The cubic root of 6990390 is about 191.2055388124.

The spelling of 6990390 in words is "six million, nine hundred ninety thousand, three hundred ninety".