43399879 has 2 divisors, whose sum is σ = 43399880. Its totient is φ = 43399878.

The previous prime is 43399877. The next prime is 43399897. The reversal of 43399879 is 97899334.

Together with next prime (43399897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43399879 - 2¹ = 43399877 is a prime.

Together with 43399877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43399877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21699939 + 21699940.

It is an arithmetic number, because the mean of its divisors is an integer number (21699940).

Almost surely, 2^43399879 is an apocalyptic number.

43399879 is a deficient number, since it is larger than the sum of its proper divisors (1).

43399879 is an equidigital number, since it uses as much as digits as its factorization.

43399879 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 43399879 is about 6587.8584532456. The cubic root of 43399879 is about 351.4224532785.

The spelling of 43399879 in words is "forty-three million, three hundred ninety-nine thousand, eight hundred seventy-nine".