4239945 has 60 divisors (see below), whose sum is σ = 8298180. Its totient is φ = 2068416.

The previous prime is 4239931. The next prime is 4239971. The reversal of 4239945 is 5499324.

It can be written as a sum of positive squares in 2 ways, for example, as 1871424 + 2368521 = 1368^2 + 1539^2 .

It is not a de Polignac number, because 4239945 - 2⁶ = 4239881 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 146191 + ... + 146219.

It is an arithmetic number, because the mean of its divisors is an integer number (138303).

Almost surely, 2^4239945 is an apocalyptic number.

4239945 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4239945 is a deficient number, since it is larger than the sum of its proper divisors (4058235).

4239945 is a wasteful number, since it uses less digits than its factorization.

4239945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 56 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 4239945 is about 2059.1126729735. The cubic root of 4239945 is about 161.8527468503.

It can be divided in two parts, 4239 and 945, that added together give a square (5184 = 72²).

The spelling of 4239945 in words is "four million, two hundred thirty-nine thousand, nine hundred forty-five".