40839390 has 80 divisors (see below), whose sum is σ = 110956032. Its totient is φ = 10777536.

The previous prime is 40839371. The next prime is 40839401. The reversal of 40839390 is 9393804.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 102672 + ... + 103068.

Almost surely, 2^40839390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40839390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55478016).

40839390 is an abundant number, since it is smaller than the sum of its proper divisors (70116642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40839390 is a wasteful number, since it uses less digits than its factorization.

40839390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40839390 is about 6390.5703970772. The cubic root of 40839390 is about 344.3708761445.

The spelling of 40839390 in words is "forty million, eight hundred thirty-nine thousand, three hundred ninety".