40007860 has 12 divisors (see below), whose sum is σ = 84016548. Its totient is φ = 16003136.

The previous prime is 40007843. The next prime is 40007881. The reversal of 40007860 is 6870004.

It can be written as a sum of positive squares in 2 ways, for example, as 15147664 + 24860196 = 3892^2 + 4986^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000177 + ... + 1000216.

It is an arithmetic number, because the mean of its divisors is an integer number (7001379).

Almost surely, 2^40007860 is an apocalyptic number.

It is an amenable number.

40007860 is an abundant number, since it is smaller than the sum of its proper divisors (44008688).

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

40007860 is a wasteful number, since it uses less digits than its factorization.

40007860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000402 (or 2000400 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 40007860 is about 6325.1766773743. The cubic root of 40007860 is about 342.0175885532.

Adding to 40007860 its reverse (6870004), we get a palindrome (46877864).

The spelling of 40007860 in words is "forty million, seven thousand, eight hundred sixty".