40520144 has 20 divisors (see below), whose sum is σ = 89723424. Its totient is φ = 17365728.

The previous prime is 40520111. The next prime is 40520149. The reversal of 40520144 is 44102504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40520149) 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 3 ways as a sum of consecutive naturals, for example, 180782 + ... + 181005.

Almost surely, 2^40520144 is an apocalyptic number.

It is an amenable number.

40520144 is an abundant number, since it is smaller than the sum of its proper divisors (49203280).

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

40520144 is a wasteful number, since it uses less digits than its factorization.

40520144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361802 (or 361796 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40520144 is about 6365.5434960418. The cubic root of 40520144 is about 343.4711994368.

Adding to 40520144 its reverse (44102504), we get a palindrome (84622648).

The spelling of 40520144 in words is "forty million, five hundred twenty thousand, one hundred forty-four".