40142881 has 4 divisors (see below), whose sum is σ = 40156564. Its totient is φ = 40129200.

The previous prime is 40142863. The next prime is 40142929. The reversal of 40142881 is 18824104.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 28302400 + 11840481 = 5320^2 + 3441^2 .

It is a cyclic number.

It is not a de Polignac number, because 40142881 - 2¹¹ = 40140833 is a prime.

It is a super-2 number, since 2×40142881² = 3222901789960322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40142821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450 + ... + 8971.

It is an arithmetic number, because the mean of its divisors is an integer number (10039141).

Almost surely, 2^40142881 is an apocalyptic number.

It is an amenable number.

40142881 is a deficient number, since it is larger than the sum of its proper divisors (13683).

40142881 is an equidigital number, since it uses as much as digits as its factorization.

40142881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13682.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 40142881 is about 6335.8409860097. The cubic root of 40142881 is about 342.4019105683.

Adding to 40142881 its reverse (18824104), we get a palindrome (58966985).

The spelling of 40142881 in words is "forty million, one hundred forty-two thousand, eight hundred eighty-one".