4045639 has 4 divisors (see below), whose sum is σ = 4356856. Its totient is φ = 3734424.

The previous prime is 4045633. The next prime is 4045663. The reversal of 4045639 is 9365404.

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

It is a cyclic number.

It is not a de Polignac number, because 4045639 - 2⁹ = 4045127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4045639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4045633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155589 + ... + 155614.

It is an arithmetic number, because the mean of its divisors is an integer number (1089214).

Almost surely, 2^4045639 is an apocalyptic number.

4045639 is a deficient number, since it is larger than the sum of its proper divisors (311217).

4045639 is a wasteful number, since it uses less digits than its factorization.

4045639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311216.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 4045639 is about 2011.3773887563. The cubic root of 4045639 is about 159.3415518170.

The spelling of 4045639 in words is "four million, forty-five thousand, six hundred thirty-nine".