3923945 has 4 divisors (see below), whose sum is σ = 4708740. Its totient is φ = 3139152.

The previous prime is 3923917. The next prime is 3923963. The reversal of 3923945 is 5493293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2474329 + 1449616 = 1573^2 + 1204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3923945 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392390 + ... + 392399.

It is an arithmetic number, because the mean of its divisors is an integer number (1177185).

Almost surely, 2^3923945 is an apocalyptic number.

It is an amenable number.

3923945 is a deficient number, since it is larger than the sum of its proper divisors (784795).

3923945 is an equidigital number, since it uses as much as digits as its factorization.

3923945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784794.

The product of its digits is 29160, while the sum is 35.

The square root of 3923945 is about 1980.8949997413. The cubic root of 3923945 is about 157.7275789557.

It can be divided in two parts, 3 and 923945, that multiplied together give a triangular number (2771835 = T₂₃₅₄).

The spelling of 3923945 in words is "three million, nine hundred twenty-three thousand, nine hundred forty-five".