1620843459 has 8 divisors (see below), whose sum is σ = 2164254912. Its totient is φ = 1078997160.

The previous prime is 1620843449. The next prime is 1620843467. The reversal of 1620843459 is 9543480261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620843459 - 2⁴ = 1620843443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620843459.

It is not an unprimeable number, because it can be changed into a prime (1620843449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388869 + ... + 393014.

It is an arithmetic number, because the mean of its divisors is an integer number (270531864).

Almost surely, 2^1620843459 is an apocalyptic number.

1620843459 is a deficient number, since it is larger than the sum of its proper divisors (543411453).

1620843459 is an equidigital number, since it uses as much as digits as its factorization.

1620843459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782577.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1620843459 is about 40259.7001851728. The cubic root of 1620843459 is about 1174.6640860198.

The spelling of 1620843459 in words is "one billion, six hundred twenty million, eight hundred forty-three thousand, four hundred fifty-nine".