1620838384 has 40 divisors (see below), whose sum is σ = 3445730352. Its totient is φ = 732472320.

The previous prime is 1620838357. The next prime is 1620838399. The reversal of 1620838384 is 4838380261.

It is a self number, because there is not a number n which added to its sum of digits gives 1620838384.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3832 + ... + 57064.

Almost surely, 2^1620838384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620838384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722865176).

1620838384 is an abundant number, since it is smaller than the sum of its proper divisors (1824891968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620838384 is a wasteful number, since it uses less digits than its factorization.

1620838384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53425 (or 53419 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 1620838384 is about 40259.6371568349. The cubic root of 1620838384 is about 1174.6628600272.

The spelling of 1620838384 in words is "one billion, six hundred twenty million, eight hundred thirty-eight thousand, three hundred eighty-four".