2015199900 has 216 divisors, whose sum is σ = 7263285120. Its totient is φ = 457787520.

The previous prime is 2015199889. The next prime is 2015199943. The reversal of 2015199900 is 99915102.

It is a super-2 number, since 2×2015199900² = 8122061273920020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1126807 + ... + 1128593.

It is an arithmetic number, because the mean of its divisors is an integer number (33626320).

Almost surely, 2^2015199900 is an apocalyptic number.

2015199900 is a gapful number since it is divisible by the number (20) 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 2015199900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3631642560).

2015199900 is an abundant number, since it is smaller than the sum of its proper divisors (5248085220).

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

2015199900 is a wasteful number, since it uses less digits than its factorization.

2015199900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 2015199900 is about 44890.9779354382. The cubic root of 2015199900 is about 1263.1047770701.

The spelling of 2015199900 in words is "two billion, fifteen million, one hundred ninety-nine thousand, nine hundred".