40021589 has 4 divisors (see below), whose sum is σ = 41312640. Its totient is φ = 38730540.

The previous prime is 40021573. The next prime is 40021591. The reversal of 40021589 is 98512004.

40021589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40021589 - 2⁴ = 40021573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645479 + ... + 645540.

It is an arithmetic number, because the mean of its divisors is an integer number (10328160).

Almost surely, 2^40021589 is an apocalyptic number.

It is an amenable number.

40021589 is a deficient number, since it is larger than the sum of its proper divisors (1291051).

40021589 is a wasteful number, since it uses less digits than its factorization.

40021589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291050.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 40021589 is about 6326.2618504137. The cubic root of 40021589 is about 342.0567060538.

The spelling of 40021589 in words is "forty million, twenty-one thousand, five hundred eighty-nine".