43438243 has 2 divisors, whose sum is σ = 43438244. Its totient is φ = 43438242.

The previous prime is 43438231. The next prime is 43438253. The reversal of 43438243 is 34283434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43438243 - 2¹⁷ = 43307171 is a prime.

It is equal to p_2629453 and since 43438243 and 2629453 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43438253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21719121 + 21719122.

It is an arithmetic number, because the mean of its divisors is an integer number (21719122).

Almost surely, 2^43438243 is an apocalyptic number.

43438243 is a deficient number, since it is larger than the sum of its proper divisors (1).

43438243 is an equidigital number, since it uses as much as digits as its factorization.

43438243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 31.

The square root of 43438243 is about 6590.7695301839. The cubic root of 43438243 is about 351.5259712354.

It can be divided in two parts, 43438 and 243, that added together give a square (43681 = 209²).

The spelling of 43438243 in words is "forty-three million, four hundred thirty-eight thousand, two hundred forty-three".