40039290 has 96 divisors (see below), whose sum is σ = 109264896. Its totient is φ = 10160640.

The previous prime is 40039249. The next prime is 40039313. The reversal of 40039290 is 9293004.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 315207 + ... + 315333.

It is an arithmetic number, because the mean of its divisors is an integer number (1138176).

Almost surely, 2^40039290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40039290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54632448).

40039290 is an abundant number, since it is smaller than the sum of its proper divisors (69225606).

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

40039290 is a wasteful number, since it uses less digits than its factorization.

40039290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 40039290 is about 6327.6607051896. The cubic root of 40039290 is about 342.1071276178.

The spelling of 40039290 in words is "forty million, thirty-nine thousand, two hundred ninety".