43842731 has 2 divisors, whose sum is σ = 43842732. Its totient is φ = 43842730.

The previous prime is 43842719. The next prime is 43842749. The reversal of 43842731 is 13724834.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43842731 is a prime.

It is a super-2 number, since 2×43842731² = 3844370123076722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43842431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21921365 + 21921366.

It is an arithmetic number, because the mean of its divisors is an integer number (21921366).

Almost surely, 2^43842731 is an apocalyptic number.

43842731 is a deficient number, since it is larger than the sum of its proper divisors (1).

43842731 is an equidigital number, since it uses as much as digits as its factorization.

43842731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 43842731 is about 6621.3843718667. The cubic root of 43842731 is about 352.6137144651.

The spelling of 43842731 in words is "forty-three million, eight hundred forty-two thousand, seven hundred thirty-one".