6997978 has 16 divisors (see below), whose sum is σ = 11450880. Its totient is φ = 3188016.

The previous prime is 6997967. The next prime is 6998009. The reversal of 6997978 is 8797996.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351 + ... + 3757.

It is an arithmetic number, because the mean of its divisors is an integer number (715680).

Almost surely, 2^6997978 is an apocalyptic number.

6997978 is a deficient number, since it is larger than the sum of its proper divisors (4452902).

6997978 is a wasteful number, since it uses less digits than its factorization.

6997978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501.

The product of its digits is 1714608, while the sum is 55.

The square root of 6997978 is about 2645.3691613837. The cubic root of 6997978 is about 191.2746977090.

The spelling of 6997978 in words is "six million, nine hundred ninety-seven thousand, nine hundred seventy-eight".