11215890 has 96 divisors (see below), whose sum is σ = 35118720. Its totient is φ = 2426112.

The previous prime is 11215889. The next prime is 11215907. The reversal of 11215890 is 9851211.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11502 + ... + 12438.

It is an arithmetic number, because the mean of its divisors is an integer number (365820).

Almost surely, 2^11215890 is an apocalyptic number.

11215890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11215890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17559360).

11215890 is an abundant number, since it is smaller than the sum of its proper divisors (23902830).

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

11215890 is a wasteful number, since it uses less digits than its factorization.

11215890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 11215890 is about 3349.0132875222. The cubic root of 11215890 is about 223.8435477458.

The spelling of 11215890 in words is "eleven million, two hundred fifteen thousand, eight hundred ninety".