3945393779 has 8 divisors (see below), whose sum is σ = 4248281520. Its totient is φ = 3650373376.

The previous prime is 3945393743. The next prime is 3945393799. The reversal of 3945393779 is 9773935493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3945393779 is a prime.

It is a super-2 number, since 2×3945393779² = 31132264142743801682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3945393799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1965794 + ... + 1967799.

It is an arithmetic number, because the mean of its divisors is an integer number (531035190).

Almost surely, 2^3945393779 is an apocalyptic number.

3945393779 is a deficient number, since it is larger than the sum of its proper divisors (302887741).

3945393779 is a wasteful number, since it uses less digits than its factorization.

3945393779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933669.

The product of its digits is 19289340, while the sum is 59.

The square root of 3945393779 is about 62812.3696336956. The cubic root of 3945393779 is about 1580.1444319978.

The spelling of 3945393779 in words is "three billion, nine hundred forty-five million, three hundred ninety-three thousand, seven hundred seventy-nine".