40018943 has 2 divisors, whose sum is σ = 40018944. Its totient is φ = 40018942.

The previous prime is 40018931. The next prime is 40018961. The reversal of 40018943 is 34981004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40018943 - 2¹² = 40014847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40018243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009471 + 20009472.

It is an arithmetic number, because the mean of its divisors is an integer number (20009472).

Almost surely, 2^40018943 is an apocalyptic number.

40018943 is a deficient number, since it is larger than the sum of its proper divisors (1).

40018943 is an equidigital number, since it uses as much as digits as its factorization.

40018943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40018943 is about 6326.0527187180. The cubic root of 40018943 is about 342.0491676059.

Adding to 40018943 its reverse (34981004), we get a palindrome (74999947).

The spelling of 40018943 in words is "forty million, eighteen thousand, nine hundred forty-three".