11861540 has 24 divisors (see below), whose sum is σ = 25002432. Its totient is φ = 4726880.

The previous prime is 11861539. The next prime is 11861569. The reversal of 11861540 is 4516811.

It is a super-2 number, since 2×11861540² = 281392262343200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5267 + ... + 7173.

It is an arithmetic number, because the mean of its divisors is an integer number (1041768).

Almost surely, 2^11861540 is an apocalyptic number.

11861540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11861540 is an abundant number, since it is smaller than the sum of its proper divisors (13140892).

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

11861540 is a wasteful number, since it uses less digits than its factorization.

11861540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227 (or 2225 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 11861540 is about 3444.0586522300. The cubic root of 11861540 is about 228.0589003464.

The spelling of 11861540 in words is "eleven million, eight hundred sixty-one thousand, five hundred forty".