406739939 has 2 divisors, whose sum is σ = 406739940. Its totient is φ = 406739938.

The previous prime is 406739929. The next prime is 406739941. The reversal of 406739939 is 939937604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406739939 - 2¹⁶ = 406674403 is a prime.

Together with 406739941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406739929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203369969 + 203369970.

It is an arithmetic number, because the mean of its divisors is an integer number (203369970).

Almost surely, 2^406739939 is an apocalyptic number.

406739939 is a deficient number, since it is larger than the sum of its proper divisors (1).

406739939 is an equidigital number, since it uses as much as digits as its factorization.

406739939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 406739939 is about 20167.7945993111. The cubic root of 406739939 is about 740.9216292598.

The spelling of 406739939 in words is "four hundred six million, seven hundred thirty-nine thousand, nine hundred thirty-nine".