115821620 has 12 divisors (see below), whose sum is σ = 243225444. Its totient is φ = 46328640.

The previous prime is 115821617. The next prime is 115821647. The reversal of 115821620 is 26128511.

It can be written as a sum of positive squares in 2 ways, for example, as 89340304 + 26481316 = 9452^2 + 5146^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 115821620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895521 + ... + 2895560.

It is an arithmetic number, because the mean of its divisors is an integer number (20268787).

Almost surely, 2^115821620 is an apocalyptic number.

115821620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115821620 is an abundant number, since it is smaller than the sum of its proper divisors (127403824).

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

115821620 is a wasteful number, since it uses less digits than its factorization.

115821620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791090 (or 5791088 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 115821620 is about 10762.0453446359. The cubic root of 115821620 is about 487.4497796174.

The spelling of 115821620 in words is "one hundred fifteen million, eight hundred twenty-one thousand, six hundred twenty".