3948777491 has 4 divisors (see below), whose sum is σ = 3969237672. Its totient is φ = 3928317312.

The previous prime is 3948777487. The next prime is 3948777523. The reversal of 3948777491 is 1947778493.

3948777491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1947778493 = 3407 ⋅571699.

It is a cyclic number.

It is not a de Polignac number, because 3948777491 - 2² = 3948777487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3948777491.

It is not an unprimeable number, because it can be changed into a prime (3948777461) 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, 10229801 + ... + 10230186.

It is an arithmetic number, because the mean of its divisors is an integer number (992309418).

Almost surely, 2^3948777491 is an apocalyptic number.

3948777491 is a deficient number, since it is larger than the sum of its proper divisors (20460181).

3948777491 is a wasteful number, since it uses less digits than its factorization.

3948777491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20460180.

The product of its digits is 10668672, while the sum is 59.

The square root of 3948777491 is about 62839.2989378462. The cubic root of 3948777491 is about 1580.5960325376.

The spelling of 3948777491 in words is "three billion, nine hundred forty-eight million, seven hundred seventy-seven thousand, four hundred ninety-one".