11421858 has 48 divisors (see below), whose sum is σ = 27762624. Its totient is φ = 3068160.

The previous prime is 11421803. The next prime is 11421859. The reversal of 11421858 is 85812411.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11668 + ... + 12608.

It is an arithmetic number, because the mean of its divisors is an integer number (578388).

Almost surely, 2^11421858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11421858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13881312).

11421858 is an abundant number, since it is smaller than the sum of its proper divisors (16340766).

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

11421858 is a wasteful number, since it uses less digits than its factorization.

11421858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 970 counting only the distinct ones).

The product of its digits is 2560, while the sum is 30.

The square root of 11421858 is about 3379.6239435772. The cubic root of 11421858 is about 225.2054617056.

The spelling of 11421858 in words is "eleven million, four hundred twenty-one thousand, eight hundred fifty-eight".