40440540 has 96 divisors (see below), whose sum is σ = 131281920. Its totient is φ = 9110016.

The previous prime is 40440527. The next prime is 40440557. The reversal of 40440540 is 4504404.

40440540 = 708² + 709² + ... + 780².

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30001 + ... + 31319.

It is an arithmetic number, because the mean of its divisors is an integer number (1367520).

Almost surely, 2^40440540 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 40440540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65640960).

40440540 is an abundant number, since it is smaller than the sum of its proper divisors (90841380).

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

40440540 is a wasteful number, since it uses less digits than its factorization.

40440540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 40440540 is about 6359.2876959609. The cubic root of 40440540 is about 343.2461294432.

Adding to 40440540 its reverse (4504404), we get a palindrome (44944944).

The spelling of 40440540 in words is "forty million, four hundred forty thousand, five hundred forty".