43940839 has 2 divisors, whose sum is σ = 43940840. Its totient is φ = 43940838.

The previous prime is 43940821. The next prime is 43940851. The reversal of 43940839 is 93804934.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43940839 - 2¹⁷ = 43809767 is a prime.

It is equal to p_2657956 and since 43940839 and 2657956 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43940639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21970419 + 21970420.

It is an arithmetic number, because the mean of its divisors is an integer number (21970420).

Almost surely, 2^43940839 is an apocalyptic number.

43940839 is a deficient number, since it is larger than the sum of its proper divisors (1).

43940839 is an equidigital number, since it uses as much as digits as its factorization.

43940839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 43940839 is about 6628.7886525368. The cubic root of 43940839 is about 352.8765360961.

The spelling of 43940839 in words is "forty-three million, nine hundred forty thousand, eight hundred thirty-nine".