1620040579 has 2 divisors, whose sum is σ = 1620040580. Its totient is φ = 1620040578.

The previous prime is 1620040573. The next prime is 1620040607. The reversal of 1620040579 is 9750400261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620040579 - 2¹¹ = 1620038531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620040573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810020289 + 810020290.

It is an arithmetic number, because the mean of its divisors is an integer number (810020290).

Almost surely, 2^1620040579 is an apocalyptic number.

1620040579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620040579 is an equidigital number, since it uses as much as digits as its factorization.

1620040579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1620040579 is about 40249.7276885198. The cubic root of 1620040579 is about 1174.4700985289.

The spelling of 1620040579 in words is "one billion, six hundred twenty million, forty thousand, five hundred seventy-nine".