3945145 has 4 divisors (see below), whose sum is σ = 4734180. Its totient is φ = 3156112.

The previous prime is 3945127. The next prime is 3945157. The reversal of 3945145 is 5415493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5415493 = 1489 ⋅3637.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 1610361 = 1528^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945145 - 2⁷ = 3945017 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394510 + ... + 394519.

It is an arithmetic number, because the mean of its divisors is an integer number (1183545).

Almost surely, 2^3945145 is an apocalyptic number.

It is an amenable number.

3945145 is a deficient number, since it is larger than the sum of its proper divisors (789035).

3945145 is an equidigital number, since it uses as much as digits as its factorization.

3945145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789034.

The product of its digits is 10800, while the sum is 31.

The square root of 3945145 is about 1986.2389080873. The cubic root of 3945145 is about 158.0111219004.

The spelling of 3945145 in words is "three million, nine hundred forty-five thousand, one hundred forty-five".