40021239 has 8 divisors (see below), whose sum is σ = 56170240. Its totient is φ = 25276536.

The previous prime is 40021231. The next prime is 40021243. The reversal of 40021239 is 93212004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40021239 - 2³ = 40021231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351007 + ... + 351120.

It is an arithmetic number, because the mean of its divisors is an integer number (7021280).

Almost surely, 2^40021239 is an apocalyptic number.

40021239 is a deficient number, since it is larger than the sum of its proper divisors (16149001).

40021239 is a wasteful number, since it uses less digits than its factorization.

40021239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702149.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40021239 is about 6326.2341878878. The cubic root of 40021239 is about 342.0557089237.

The spelling of 40021239 in words is "forty million, twenty-one thousand, two hundred thirty-nine".