4023945 has 32 divisors (see below), whose sum is σ = 7338240. Its totient is φ = 2090880.

The previous prime is 4023937. The next prime is 4023947. The reversal of 4023945 is 5493204.

It is not a de Polignac number, because 4023945 - 2³ = 4023937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5172 + ... + 5898.

It is an arithmetic number, because the mean of its divisors is an integer number (229320).

Almost surely, 2^4023945 is an apocalyptic number.

4023945 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4023945 is a deficient number, since it is larger than the sum of its proper divisors (3314295).

4023945 is a wasteful number, since it uses less digits than its factorization.

4023945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 4023945 is about 2005.9773179176. The cubic root of 4023945 is about 159.0562278885.

The spelling of 4023945 in words is "four million, twenty-three thousand, nine hundred forty-five".