40143643 has 4 divisors (see below), whose sum is σ = 40159960. Its totient is φ = 40127328.

The previous prime is 40143641. The next prime is 40143661. The reversal of 40143643 is 34634104.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40143643 - 2¹ = 40143641 is a prime.

It is a super-2 number, since 2×40143643² = 3223024146622898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40143641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3630 + ... + 9667.

It is an arithmetic number, because the mean of its divisors is an integer number (10039990).

Almost surely, 2^40143643 is an apocalyptic number.

40143643 is a deficient number, since it is larger than the sum of its proper divisors (16317).

40143643 is a wasteful number, since it uses less digits than its factorization.

40143643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16316.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 40143643 is about 6335.9011198092. The cubic root of 40143643 is about 342.4040770679.

Adding to 40143643 its reverse (34634104), we get a palindrome (74777747).

It can be divided in two parts, 401 and 43643, that added together give a palindrome (44044).

The spelling of 40143643 in words is "forty million, one hundred forty-three thousand, six hundred forty-three".