40142240 has 24 divisors (see below), whose sum is σ = 94836420. Its totient is φ = 16056832.

The previous prime is 40142213. The next prime is 40142251. The reversal of 40142240 is 4224104.

It can be written as a sum of positive squares in 2 ways, for example, as 35664784 + 4477456 = 5972^2 + 2116^2 .

It is a super-2 number, since 2×40142240² = 3222798864435200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125285 + ... + 125604.

Almost surely, 2^40142240 is an apocalyptic number.

40142240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40142240 is an abundant number, since it is smaller than the sum of its proper divisors (54694180).

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

40142240 is a wasteful number, since it uses less digits than its factorization.

40142240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250904 (or 250896 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 40142240 is about 6335.7904005736. The cubic root of 40142240 is about 342.4000880717.

Adding to 40142240 its reverse (4224104), we get a palindrome (44366344).

The spelling of 40142240 in words is "forty million, one hundred forty-two thousand, two hundred forty".