43740427 has 2 divisors, whose sum is σ = 43740428. Its totient is φ = 43740426.

The previous prime is 43740383. The next prime is 43740443. The reversal of 43740427 is 72404734.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43740427 is a prime.

It is not a weakly prime, because it can be changed into another prime (43740467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21870213 + 21870214.

It is an arithmetic number, because the mean of its divisors is an integer number (21870214).

Almost surely, 2^43740427 is an apocalyptic number.

43740427 is a deficient number, since it is larger than the sum of its proper divisors (1).

43740427 is an equidigital number, since it uses as much as digits as its factorization.

43740427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 31.

The square root of 43740427 is about 6613.6545872914. The cubic root of 43740427 is about 352.3392342368.

The spelling of 43740427 in words is "forty-three million, seven hundred forty thousand, four hundred twenty-seven".