6940391856 has 40 divisors (see below), whose sum is σ = 18033005040. Its totient is φ = 2300088576.

The previous prime is 6940391849. The next prime is 6940391863. The reversal of 6940391856 is 6581930496.

It is an interprime number because it is at equal distance from previous prime (6940391849) and next prime (6940391863).

It is a super-2 number, since 2×6940391856² = 96338078229662249472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6940391799 and 6940391808.

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, 409591 + ... + 426198.

It is an arithmetic number, because the mean of its divisors is an integer number (450825126).

Almost surely, 2^6940391856 is an apocalyptic number.

It is an amenable number.

6940391856 is an abundant number, since it is smaller than the sum of its proper divisors (11092613184).

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

6940391856 is a wasteful number, since it uses less digits than its factorization.

6940391856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835973 (or 835967 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 6940391856 is about 83309.0142541610. The cubic root of 6940391856 is about 1907.4858742492.

The spelling of 6940391856 in words is "six billion, nine hundred forty million, three hundred ninety-one thousand, eight hundred fifty-six".