40443643 has 2 divisors, whose sum is σ = 40443644. Its totient is φ = 40443642.

The previous prime is 40443631. The next prime is 40443653. The reversal of 40443643 is 34634404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40443643 is a prime.

It is a super-2 number, since 2×40443643² = 3271376518222898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40443653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221821 + 20221822.

It is an arithmetic number, because the mean of its divisors is an integer number (20221822).

Almost surely, 2^40443643 is an apocalyptic number.

40443643 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443643 is an equidigital number, since it uses as much as digits as its factorization.

40443643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 40443643 is about 6359.5316651464. The cubic root of 40443643 is about 343.2549083030.

The spelling of 40443643 in words is "forty million, four hundred forty-three thousand, six hundred forty-three".