1361021620 has 96 divisors (see below), whose sum is σ = 3394298880. Its totient is φ = 448519680.

The previous prime is 1361021611. The next prime is 1361021639. The reversal of 1361021620 is 261201631.

It is a junction number, because it is equal to n+sod(n) for n = 1361021591 and 1361021600.

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, 1099642 + ... + 1100878.

It is an arithmetic number, because the mean of its divisors is an integer number (35357280).

Almost surely, 2^1361021620 is an apocalyptic number.

1361021620 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 1361021620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697149440).

1361021620 is an abundant number, since it is smaller than the sum of its proper divisors (2033277260).

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

1361021620 is a wasteful number, since it uses less digits than its factorization.

1361021620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1361021620 is about 36892.0265098029. The cubic root of 1361021620 is about 1108.2090047409.

The spelling of 1361021620 in words is "one billion, three hundred sixty-one million, twenty-one thousand, six hundred twenty".