8121900 has 36 divisors (see below), whose sum is σ = 23500232. Its totient is φ = 2165760.

The previous prime is 8121889. The next prime is 8121901. The reversal of 8121900 is 91218.

It is a super-2 number, since 2×8121900² = 131930519220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8121901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13237 + ... + 13836.

Almost surely, 2^8121900 is an apocalyptic number.

It is an amenable number.

8121900 is an abundant number, since it is smaller than the sum of its proper divisors (15378332).

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

8121900 is a wasteful number, since it uses less digits than its factorization.

8121900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27090 (or 27083 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 8121900 is about 2849.8947348981. The cubic root of 8121900 is about 201.0107169851.

The spelling of 8121900 in words is "eight million, one hundred twenty-one thousand, nine hundred".