3920545 has 4 divisors (see below), whose sum is σ = 4704660. Its totient is φ = 3136432.

The previous prime is 3920513. The next prime is 3920551. The reversal of 3920545 is 5450293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5450293 = 43 ⋅126751.

It can be written as a sum of positive squares in 2 ways, for example, as 2692881 + 1227664 = 1641^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 3920545 - 2⁵ = 3920513 is a prime.

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, 392050 + ... + 392059.

It is an arithmetic number, because the mean of its divisors is an integer number (1176165).

Almost surely, 2^3920545 is an apocalyptic number.

It is an amenable number.

3920545 is a deficient number, since it is larger than the sum of its proper divisors (784115).

3920545 is an equidigital number, since it uses as much as digits as its factorization.

3920545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784114.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 3920545 is about 1980.0366158231. The cubic root of 3920545 is about 157.6820101270.

It can be divided in two parts, 3920 and 545, that added together give a triangular number (4465 = T₉₄).

The spelling of 3920545 in words is "three million, nine hundred twenty thousand, five hundred forty-five".