3945391769 has 4 divisors (see below), whose sum is σ = 4304063760. Its totient is φ = 3586719780.

The previous prime is 3945391763. The next prime is 3945391777. The reversal of 3945391769 is 9671935493.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3945391769 is a prime.

It is a super-2 number, since 2×3945391769² = 31132232421785898722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3945391763) 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, 179335979 + ... + 179336000.

It is an arithmetic number, because the mean of its divisors is an integer number (1076015940).

Almost surely, 2^3945391769 is an apocalyptic number.

It is an amenable number.

3945391769 is a deficient number, since it is larger than the sum of its proper divisors (358671991).

3945391769 is a wasteful number, since it uses less digits than its factorization.

3945391769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358671990.

The product of its digits is 5511240, while the sum is 56.

The square root of 3945391769 is about 62812.3536336603. The cubic root of 3945391769 is about 1580.1441636603.

The spelling of 3945391769 in words is "three billion, nine hundred forty-five million, three hundred ninety-one thousand, seven hundred sixty-nine".