40023040 has 44 divisors (see below), whose sum is σ = 96020676. Its totient is φ = 16007168.

The previous prime is 40023007. The next prime is 40023041. The reversal of 40023040 is 4032004.

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 35426304 = 2144^2 + 5952^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40023040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40023041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212 + ... + 9028.

Almost surely, 2^40023040 is an apocalyptic number.

40023040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40023040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48010338).

40023040 is an abundant number, since it is smaller than the sum of its proper divisors (55997636).

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

40023040 is an equidigital number, since it uses as much as digits as its factorization.

40023040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7842 (or 7824 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 40023040 is about 6326.3765300526. The cubic root of 40023040 is about 342.0608398084.

Adding to 40023040 its reverse (4032004), we get a palindrome (44055044).

The spelling of 40023040 in words is "forty million, twenty-three thousand, forty".