40521240 has 48 divisors (see below), whose sum is σ = 131695200. Its totient is φ = 10805568.

The previous prime is 40521227. The next prime is 40521241. The reversal of 40521240 is 4212504.

40521240 is a `hidden beast` number, since 405 + 21 + 240 = 666.

It is a super-2 number, since 2×40521240² = 3283941782275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55920 + ... + 56639.

It is an arithmetic number, because the mean of its divisors is an integer number (2743650).

Almost surely, 2^40521240 is an apocalyptic number.

40521240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40521240 is an abundant number, since it is smaller than the sum of its proper divisors (91173960).

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

40521240 is a wasteful number, since it uses less digits than its factorization.

40521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112576 (or 112569 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40521240 is about 6365.6295839453. The cubic root of 40521240 is about 343.4742961767.

Adding to 40521240 its reverse (4212504), we get a palindrome (44733744).

The spelling of 40521240 in words is "forty million, five hundred twenty-one thousand, two hundred forty".