40001442 has 64 divisors (see below), whose sum is σ = 92461824. Its totient is φ = 11427840.

The previous prime is 40001407. The next prime is 40001443. The reversal of 40001442 is 24410004.

40001442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (40001443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128467 + ... + 128777.

It is an arithmetic number, because the mean of its divisors is an integer number (1444716).

Almost surely, 2^40001442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40001442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46230912).

40001442 is an abundant number, since it is smaller than the sum of its proper divisors (52460382).

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

40001442 is a wasteful number, since it uses less digits than its factorization.

40001442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

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

The square root of 40001442 is about 6324.6693194190. The cubic root of 40001442 is about 341.9992989281. Note that the first 3 decimals are identical.

Adding to 40001442 its reverse (24410004), we get a palindrome (64411446).

The spelling of 40001442 in words is "forty million, one thousand, four hundred forty-two".