3921992745 has 32 divisors (see below), whose sum is σ = 7066497024. Its totient is φ = 1840228800.

The previous prime is 3921992707. The next prime is 3921992761. The reversal of 3921992745 is 5472991293.

3921992745 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3921992745 - 2²¹ = 3919895593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378267 + ... + 388496.

It is an arithmetic number, because the mean of its divisors is an integer number (220828032).

Almost surely, 2^3921992745 is an apocalyptic number.

It is an amenable number.

3921992745 is a deficient number, since it is larger than the sum of its proper divisors (3144504279).

3921992745 is a wasteful number, since it uses less digits than its factorization.

3921992745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766813.

The product of its digits is 1224720, while the sum is 51.

The square root of 3921992745 is about 62625.8153240339. The cubic root of 3921992745 is about 1577.0141688873.

The spelling of 3921992745 in words is "three billion, nine hundred twenty-one million, nine hundred ninety-two thousand, seven hundred forty-five".