40142540 has 24 divisors (see below), whose sum is σ = 84777840. Its totient is φ = 15965888.

The previous prime is 40142533. The next prime is 40142549. The reversal of 40142540 is 4524104.

It is a super-2 number, since 2×40142540² = 3222847035303200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (40142549) 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 7 ways as a sum of consecutive naturals, for example, 2027 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (3532410).

Almost surely, 2^40142540 is an apocalyptic number.

It is an amenable number.

40142540 is an abundant number, since it is smaller than the sum of its proper divisors (44635300).

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

40142540 is a wasteful number, since it uses less digits than its factorization.

40142540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11401 (or 11399 counting only the distinct ones).

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

The square root of 40142540 is about 6335.8140755549. The cubic root of 40142540 is about 342.4009410367.

Adding to 40142540 its reverse (4524104), we get a palindrome (44666644).

The spelling of 40142540 in words is "forty million, one hundred forty-two thousand, five hundred forty".