1620345439 has 2 divisors, whose sum is σ = 1620345440. Its totient is φ = 1620345438.

The previous prime is 1620345431. The next prime is 1620345547. The reversal of 1620345439 is 9345430261.

It is a weak prime.

It is an emirp because it is prime and its reverse (9345430261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620345439 - 2³ = 1620345431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620345398 and 1620345407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620345431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810172719 + 810172720.

It is an arithmetic number, because the mean of its divisors is an integer number (810172720).

Almost surely, 2^1620345439 is an apocalyptic number.

1620345439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620345439 is an equidigital number, since it uses as much as digits as its factorization.

1620345439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1620345439 is about 40253.5146167387. The cubic root of 1620345439 is about 1174.5437646872.

The spelling of 1620345439 in words is "one billion, six hundred twenty million, three hundred forty-five thousand, four hundred thirty-nine".