40042340 has 48 divisors (see below), whose sum is σ = 91024752. Its totient is φ = 14708736.

The previous prime is 40042339. The next prime is 40042351. The reversal of 40042340 is 4324004.

It can be written as a sum of positive squares in 8 ways, for example, as 1304164 + 38738176 = 1142^2 + 6224^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87392 + ... + 87848.

It is an arithmetic number, because the mean of its divisors is an integer number (1896349).

Almost surely, 2^40042340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40042340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45512376).

40042340 is an abundant number, since it is smaller than the sum of its proper divisors (50982412).

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

40042340 is a wasteful number, since it uses less digits than its factorization.

40042340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40042340 is about 6327.9017059370. The cubic root of 40042340 is about 342.1158140875.

Adding to 40042340 its reverse (4324004), we get a palindrome (44366344).

The spelling of 40042340 in words is "forty million, forty-two thousand, three hundred forty".