40002040 has 64 divisors (see below), whose sum is σ = 99237600. Its totient is φ = 14418432.

The previous prime is 40002023. The next prime is 40002041. The reversal of 40002040 is 4020004.

40002040 is a nontrivial binomial coefficient, being equal to C(8945, 2).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40002041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21466 + ... + 23254.

Almost surely, 2^40002040 is an apocalyptic number.

40002040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

40002040 is the 8944-th triangular number.

40002040 is the 2982-nd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40002040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49618800).

40002040 is an abundant number, since it is smaller than the sum of its proper divisors (59235560).

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

40002040 is a wasteful number, since it uses less digits than its factorization.

40002040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 40002040 is about 6324.7165944412. The cubic root of 40002040 is about 342.0010031547.

Adding to 40002040 its reverse (4020004), we get a palindrome (44022044).

The spelling of 40002040 in words is "forty million, two thousand, forty", and thus it is an eban number.