6990387 has 8 divisors (see below), whose sum is σ = 9332736. Its totient is φ = 4654152.

The previous prime is 6990371. The next prime is 6990419. The reversal of 6990387 is 7830996.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6990387 - 2⁴ = 6990371 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6990307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3678 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (1166592).

Almost surely, 2^6990387 is an apocalyptic number.

6990387 is a deficient number, since it is larger than the sum of its proper divisors (2342349).

6990387 is a wasteful number, since it uses less digits than its factorization.

6990387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 6990387 is about 2643.9340006891. The cubic root of 6990387 is about 191.2055114597.

The spelling of 6990387 in words is "six million, nine hundred ninety thousand, three hundred eighty-seven".