3981916457 has 4 divisors (see below), whose sum is σ = 3982425216. Its totient is φ = 3981407700.

The previous prime is 3981916439. The next prime is 3981916483. The reversal of 3981916457 is 7546191893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7546191893 = 11467 ⋅658079.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3981916457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3981916399 and 3981916408.

It is not an unprimeable number, because it can be changed into a prime (3981913457) 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, 242453 + ... + 258354.

It is an arithmetic number, because the mean of its divisors is an integer number (995606304).

Almost surely, 2^3981916457 is an apocalyptic number.

It is an amenable number.

3981916457 is a deficient number, since it is larger than the sum of its proper divisors (508759).

3981916457 is an equidigital number, since it uses as much as digits as its factorization.

3981916457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508758.

The product of its digits is 1632960, while the sum is 53.

The square root of 3981916457 is about 63102.4282971741. The cubic root of 3981916457 is about 1585.0052850716.

The spelling of 3981916457 in words is "three billion, nine hundred eighty-one million, nine hundred sixteen thousand, four hundred fifty-seven".