11981340 has 144 divisors (see below), whose sum is σ = 42823872. Its totient is φ = 2654208.

The previous prime is 11981329. The next prime is 11981341. The reversal of 11981340 is 4318911.

11981340 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46492 + ... + 46748.

It is an arithmetic number, because the mean of its divisors is an integer number (297388).

Almost surely, 2^11981340 is an apocalyptic number.

11981340 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 11981340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21411936).

11981340 is an abundant number, since it is smaller than the sum of its proper divisors (30842532).

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

11981340 is a wasteful number, since it uses less digits than its factorization.

11981340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 11981340 is about 3461.4072282816. The cubic root of 11981340 is about 228.8241182377.

It can be divided in two parts, 11981 and 340, that added together give a palindrome (12321).

The spelling of 11981340 in words is "eleven million, nine hundred eighty-one thousand, three hundred forty".