40020144 has 40 divisors (see below), whose sum is σ = 104850432. Its totient is φ = 13151040.

The previous prime is 40020131. The next prime is 40020151. The reversal of 40020144 is 44102004.

It is a super-2 number, since 2×40020144² = 3203223851561472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464 + ... + 9279.

Almost surely, 2^40020144 is an apocalyptic number.

It is an amenable number.

40020144 is an abundant number, since it is smaller than the sum of its proper divisors (64830288).

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

40020144 is a wasteful number, since it uses less digits than its factorization.

40020144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11825 (or 11819 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40020144 is about 6326.1476429182. The cubic root of 40020144 is about 342.0525892933.

Adding to 40020144 its reverse (44102004), we get a palindrome (84122148).

The spelling of 40020144 in words is "forty million, twenty thousand, one hundred forty-four".