40143442 has 4 divisors (see below), whose sum is σ = 60215166. Its totient is φ = 20071720.

The previous prime is 40143437. The next prime is 40143451. The reversal of 40143442 is 24434104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 314721 = 6311^2 + 561^2 .

It is a super-2 number, since 2×40143442² = 3222991871214728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10035859 + ... + 10035862.

Almost surely, 2^40143442 is an apocalyptic number.

40143442 is a deficient number, since it is larger than the sum of its proper divisors (20071724).

40143442 is a wasteful number, since it uses less digits than its factorization.

40143442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20071723.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40143442 is about 6335.8852577994. The cubic root of 40143442 is about 342.4035055923.

Adding to 40143442 its reverse (24434104), we get a palindrome (64577546).

The spelling of 40143442 in words is "forty million, one hundred forty-three thousand, four hundred forty-two".