3913940647 has 4 divisors (see below), whose sum is σ = 4009402656. Its totient is φ = 3818478640.

The previous prime is 3913940609. The next prime is 3913940677. The reversal of 3913940647 is 7460493193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3913940647 - 2⁷ = 3913940519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3913940597 and 3913940606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3913940677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47730943 + ... + 47731024.

It is an arithmetic number, because the mean of its divisors is an integer number (1002350664).

Almost surely, 2^3913940647 is an apocalyptic number.

3913940647 is a deficient number, since it is larger than the sum of its proper divisors (95462009).

3913940647 is an equidigital number, since it uses as much as digits as its factorization.

3913940647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95462008.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 3913940647 is about 62561.4949229956. The cubic root of 3913940647 is about 1575.9341930090.

The spelling of 3913940647 in words is "three billion, nine hundred thirteen million, nine hundred forty thousand, six hundred forty-seven".