40120144 has 20 divisors (see below), whose sum is σ = 77836660. Its totient is φ = 20033280.

The previous prime is 40120139. The next prime is 40120217. The reversal of 40120144 is 44102104.

It can be written as a sum of positive squares in 2 ways, for example, as 13987600 + 26132544 = 3740^2 + 5112^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

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, 16954 + ... + 19174.

It is an arithmetic number, because the mean of its divisors is an integer number (3891833).

Almost surely, 2^40120144 is an apocalyptic number.

It is an amenable number.

40120144 is a deficient number, since it is larger than the sum of its proper divisors (37716516).

40120144 is a wasteful number, since it uses less digits than its factorization.

40120144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3358 (or 3352 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 40120144 is about 6334.0464159966. The cubic root of 40120144 is about 342.3372526733.

Adding to 40120144 its reverse (44102104), we get a palindrome (84222248).

The spelling of 40120144 in words is "forty million, one hundred twenty thousand, one hundred forty-four".