40020343 has 4 divisors (see below), whose sum is σ = 43658568. Its totient is φ = 36382120.

The previous prime is 40020317. The next prime is 40020371. The reversal of 40020343 is 34302004.

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 40020343 - 2⁹ = 40019831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020443) 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, 1819096 + ... + 1819117.

It is an arithmetic number, because the mean of its divisors is an integer number (10914642).

Almost surely, 2^40020343 is an apocalyptic number.

40020343 is a deficient number, since it is larger than the sum of its proper divisors (3638225).

40020343 is a wasteful number, since it uses less digits than its factorization.

40020343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638224.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 40020343 is about 6326.1633712701. The cubic root of 40020343 is about 342.0531562441.

Adding to 40020343 its reverse (34302004), we get a palindrome (74322347).

The spelling of 40020343 in words is "forty million, twenty thousand, three hundred forty-three".