320284639 has 2 divisors, whose sum is σ = 320284640. Its totient is φ = 320284638.

The previous prime is 320284609. The next prime is 320284663. The reversal of 320284639 is 936482023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320284639 - 2¹¹ = 320282591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320284598 and 320284607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320284609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160142319 + 160142320.

It is an arithmetic number, because the mean of its divisors is an integer number (160142320).

Almost surely, 2^320284639 is an apocalyptic number.

320284639 is a deficient number, since it is larger than the sum of its proper divisors (1).

320284639 is an equidigital number, since it uses as much as digits as its factorization.

320284639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 320284639 is about 17896.4979535103. The cubic root of 320284639 is about 684.1931210045.

The spelling of 320284639 in words is "three hundred twenty million, two hundred eighty-four thousand, six hundred thirty-nine".