43879939 has 2 divisors, whose sum is σ = 43879940. Its totient is φ = 43879938.

The previous prime is 43879921. The next prime is 43879943. The reversal of 43879939 is 93997834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43879939 - 2¹⁷ = 43748867 is a prime.

It is not a weakly prime, because it can be changed into another prime (43879139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21939969 + 21939970.

It is an arithmetic number, because the mean of its divisors is an integer number (21939970).

Almost surely, 2^43879939 is an apocalyptic number.

43879939 is a deficient number, since it is larger than the sum of its proper divisors (1).

43879939 is an equidigital number, since it uses as much as digits as its factorization.

43879939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 43879939 is about 6624.1934603392. The cubic root of 43879939 is about 352.7134371254.

The spelling of 43879939 in words is "forty-three million, eight hundred seventy-nine thousand, nine hundred thirty-nine".