40145442 has 64 divisors (see below), whose sum is σ = 89994240. Its totient is φ = 11880000.

The previous prime is 40145431. The next prime is 40145447. The reversal of 40145442 is 24454104.

It is a happy number.

It is a super-2 number, since 2×40145442² = 3223313026750728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40145447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159817 + ... + 160067.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^40145442 is an apocalyptic number.

40145442 is an abundant number, since it is smaller than the sum of its proper divisors (49848798).

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

40145442 is a wasteful number, since it uses less digits than its factorization.

40145442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 40145442 is about 6336.0430869747. The cubic root of 40145442 is about 342.4091918315.

Adding to 40145442 its reverse (24454104), we get a palindrome (64599546).

The spelling of 40145442 in words is "forty million, one hundred forty-five thousand, four hundred forty-two".