10891540 has 48 divisors (see below), whose sum is σ = 25772544. Its totient is φ = 3830400.

The previous prime is 10891523. The next prime is 10891547. The reversal of 10891540 is 4519801.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 10891499 and 10891508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6022 + ... + 7618.

It is an arithmetic number, because the mean of its divisors is an integer number (536928).

Almost surely, 2^10891540 is an apocalyptic number.

10891540 is a gapful number since it is divisible by the number (10) 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 10891540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12886272).

10891540 is an abundant number, since it is smaller than the sum of its proper divisors (14881004).

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

10891540 is a wasteful number, since it uses less digits than its factorization.

10891540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 10891540 is about 3300.2333250848. The cubic root of 10891540 is about 221.6646453041.

The spelling of 10891540 in words is "ten million, eight hundred ninety-one thousand, five hundred forty".