8121890 has 16 divisors (see below), whose sum is σ = 16708032. Its totient is φ = 2784624.

The previous prime is 8121889. The next prime is 8121901. The reversal of 8121890 is 981218.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57944 + ... + 58083.

It is an arithmetic number, because the mean of its divisors is an integer number (1044252).

Almost surely, 2^8121890 is an apocalyptic number.

8121890 is an abundant number, since it is smaller than the sum of its proper divisors (8586142).

8121890 is a wasteful number, since it uses less digits than its factorization.

8121890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116041.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 8121890 is about 2849.8929804468. The cubic root of 8121890 is about 201.0106344876.

The spelling of 8121890 in words is "eight million, one hundred twenty-one thousand, eight hundred ninety".