3947395145 has 8 divisors (see below), whose sum is σ = 4737509640. Its totient is φ = 3157492480.

The previous prime is 3947395073. The next prime is 3947395147. The reversal of 3947395145 is 5415937493.

It can be written as a sum of positive squares in 4 ways, for example, as 163216 + 3947231929 = 404^2 + 62827^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-3947395145 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3947395093 and 3947395102.

It is not an unprimeable number, because it can be changed into a prime (3947395147) 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, 8576 + ... + 89265.

It is an arithmetic number, because the mean of its divisors is an integer number (592188705).

Almost surely, 2^3947395145 is an apocalyptic number.

It is an amenable number.

3947395145 is a deficient number, since it is larger than the sum of its proper divisors (790114495).

3947395145 is an equidigital number, since it uses as much as digits as its factorization.

3947395145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105915.

The product of its digits is 2041200, while the sum is 50.

The square root of 3947395145 is about 62828.2989185606. The cubic root of 3947395145 is about 1580.4115715986.

The spelling of 3947395145 in words is "three billion, nine hundred forty-seven million, three hundred ninety-five thousand, one hundred forty-five".