1606405139 has 2 divisors, whose sum is σ = 1606405140. Its totient is φ = 1606405138.

The previous prime is 1606405121. The next prime is 1606405181. The reversal of 1606405139 is 9315046061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606405139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1606405099 and 1606405108.

It is not a weakly prime, because it can be changed into another prime (1606405109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803202569 + 803202570.

It is an arithmetic number, because the mean of its divisors is an integer number (803202570).

Almost surely, 2^1606405139 is an apocalyptic number.

1606405139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606405139 is an equidigital number, since it uses as much as digits as its factorization.

1606405139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1606405139 is about 40079.9842689590. The cubic root of 1606405139 is about 1171.1657456002.

The spelling of 1606405139 in words is "one billion, six hundred six million, four hundred five thousand, one hundred thirty-nine".