16406639 has 2 divisors, whose sum is σ = 16406640. Its totient is φ = 16406638.

The previous prime is 16406629. The next prime is 16406653. The reversal of 16406639 is 93660461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16406639 - 2¹⁶ = 16341103 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16406599 and 16406608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16406629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8203319 + 8203320.

It is an arithmetic number, because the mean of its divisors is an integer number (8203320).

Almost surely, 2^16406639 is an apocalyptic number.

16406639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16406639 is an equidigital number, since it uses as much as digits as its factorization.

16406639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 16406639 is about 4050.5109554228. The cubic root of 16406639 is about 254.1010974580.

The spelling of 16406639 in words is "sixteen million, four hundred six thousand, six hundred thirty-nine".