406667839 has 2 divisors, whose sum is σ = 406667840. Its totient is φ = 406667838.

The previous prime is 406667809. The next prime is 406667861. The reversal of 406667839 is 938766604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406667839 - 2⁷ = 406667711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 406667792 and 406667801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406667809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203333919 + 203333920.

It is an arithmetic number, because the mean of its divisors is an integer number (203333920).

Almost surely, 2^406667839 is an apocalyptic number.

406667839 is a deficient number, since it is larger than the sum of its proper divisors (1).

406667839 is an equidigital number, since it uses as much as digits as its factorization.

406667839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 406667839 is about 20166.0070167597. The cubic root of 406667839 is about 740.8778473072.

The spelling of 406667839 in words is "four hundred six million, six hundred sixty-seven thousand, eight hundred thirty-nine".