40072943 has 2 divisors, whose sum is σ = 40072944. Its totient is φ = 40072942.

The previous prime is 40072937. The next prime is 40072951. The reversal of 40072943 is 34927004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40072943 - 2⁸ = 40072687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40072973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20036471 + 20036472.

It is an arithmetic number, because the mean of its divisors is an integer number (20036472).

Almost surely, 2^40072943 is an apocalyptic number.

40072943 is a deficient number, since it is larger than the sum of its proper divisors (1).

40072943 is an equidigital number, since it uses as much as digits as its factorization.

40072943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 40072943 is about 6330.3193442353. The cubic root of 40072943 is about 342.2029477246.

Adding to 40072943 its reverse (34927004), we get a palindrome (74999947).

The spelling of 40072943 in words is "forty million, seventy-two thousand, nine hundred forty-three".