40143642 has 48 divisors (see below), whose sum is σ = 101894112. Its totient is φ = 10426080.

The previous prime is 40143641. The next prime is 40143661. The reversal of 40143642 is 24634104.

It is a super-2 number, since 2×40143642² = 3223023986048328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40143641) 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 23 ways as a sum of consecutive naturals, for example, 2973 + ... + 9440.

It is an arithmetic number, because the mean of its divisors is an integer number (2122794).

Almost surely, 2^40143642 is an apocalyptic number.

40143642 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

40143642 is an abundant number, since it is smaller than the sum of its proper divisors (61750470).

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

40143642 is a wasteful number, since it uses less digits than its factorization.

40143642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443 (or 12436 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 40143642 is about 6335.9010408939. The cubic root of 40143642 is about 342.4040742247.

Adding to 40143642 its reverse (24634104), we get a palindrome (64777746).

The spelling of 40143642 in words is "forty million, one hundred forty-three thousand, six hundred forty-two".