3921346749 has 16 divisors (see below), whose sum is σ = 5505406400. Its totient is φ = 2475847296.

The previous prime is 3921346747. The next prime is 3921346757. The reversal of 3921346749 is 9476431293.

It is a happy number.

It is not a de Polignac number, because 3921346749 - 2¹ = 3921346747 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3921346698 and 3921346707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921346747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205707 + ... + 223959.

It is an arithmetic number, because the mean of its divisors is an integer number (344087900).

Almost surely, 2^3921346749 is an apocalyptic number.

It is an amenable number.

3921346749 is a deficient number, since it is larger than the sum of its proper divisors (1584059651).

3921346749 is a wasteful number, since it uses less digits than its factorization.

3921346749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22044.

The product of its digits is 979776, while the sum is 48.

The square root of 3921346749 is about 62620.6575260912. The cubic root of 3921346749 is about 1576.9275801853.

The spelling of 3921346749 in words is "three billion, nine hundred twenty-one million, three hundred forty-six thousand, seven hundred forty-nine".