1600021620 has 96 divisors (see below), whose sum is σ = 4983834240. Its totient is φ = 426159360.

The previous prime is 1600021613. The next prime is 1600021637. The reversal of 1600021620 is 261200061.

It is a happy number.

1600021620 is a `hidden beast` number, since 1 + 600 + 0 + 2 + 1 + 62 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1600021593 and 1600021602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712219 + ... + 714461.

It is an arithmetic number, because the mean of its divisors is an integer number (51914940).

Almost surely, 2^1600021620 is an apocalyptic number.

1600021620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1600021620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2491917120).

1600021620 is an abundant number, since it is smaller than the sum of its proper divisors (3383812620).

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

1600021620 is a wasteful number, since it uses less digits than its factorization.

1600021620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582 (or 3574 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1600021620 is about 40000.2702490871. The cubic root of 1600021620 is about 1169.6123633667.

Adding to 1600021620 its reverse (261200061), we get a palindrome (1861221681).

The spelling of 1600021620 in words is "one billion, six hundred million, twenty-one thousand, six hundred twenty".