11939840 has 104 divisors (see below), whose sum is σ = 31846608. Its totient is φ = 4259840.

The previous prime is 11939821. The next prime is 11939843. The reversal of 11939840 is 4893911.

11939840 = 66² + 67² + ... + 330².

It is a nialpdrome in base 8 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 11939840.

It is not an unprimeable number, because it can be changed into a prime (11939843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225254 + ... + 225306.

Almost surely, 2^11939840 is an apocalyptic number.

11939840 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 11939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15923304).

11939840 is an abundant number, since it is smaller than the sum of its proper divisors (19906768).

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

11939840 is an equidigital number, since it uses as much as digits as its factorization.

11939840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 11939840 is about 3455.4073565934. The cubic root of 11939840 is about 228.5596184374.

The spelling of 11939840 in words is "eleven million, nine hundred thirty-nine thousand, eight hundred forty".