7940640897 has 32 divisors (see below), whose sum is σ = 13478127360. Its totient is φ = 4526150400.

The previous prime is 7940640893. The next prime is 7940640899. The reversal of 7940640897 is 7980460497.

It is a happy number.

It is not a de Polignac number, because 7940640897 - 2² = 7940640893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7940640893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23403 + ... + 128175.

It is an arithmetic number, because the mean of its divisors is an integer number (421191480).

Almost surely, 2^7940640897 is an apocalyptic number.

It is an amenable number.

7940640897 is a deficient number, since it is larger than the sum of its proper divisors (5537486463).

7940640897 is a wasteful number, since it uses less digits than its factorization.

7940640897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105190 (or 105184 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 7940640897 is about 89110.2738016218. The cubic root of 7940640897 is about 1995.0411230146.

The spelling of 7940640897 in words is "seven billion, nine hundred forty million, six hundred forty thousand, eight hundred ninety-seven".