6990138 has 48 divisors (see below), whose sum is σ = 16554720. Its totient is φ = 2204496.

The previous prime is 6990107. The next prime is 6990161. The reversal of 6990138 is 8310996.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8856 + ... + 9612.

It is an arithmetic number, because the mean of its divisors is an integer number (344890).

Almost surely, 2^6990138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6990138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8277360).

6990138 is an abundant number, since it is smaller than the sum of its proper divisors (9564582).

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

6990138 is a wasteful number, since it uses less digits than its factorization.

6990138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6990138 is about 2643.8869113485. The cubic root of 6990138 is about 191.2032411640.

The spelling of 6990138 in words is "six million, nine hundred ninety thousand, one hundred thirty-eight".