12161340 has 60 divisors (see below), whose sum is σ = 38155656. Its totient is φ = 3242592.

The previous prime is 12161333. The next prime is 12161351. The reversal of 12161340 is 4316121.

It is a happy number.

12161340 is a `hidden beast` number, since 12 + 1 + 613 + 40 = 666.

12161340 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 tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2134 + ... + 5373.

Almost surely, 2^12161340 is an apocalyptic number.

12161340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12161340 is an abundant number, since it is smaller than the sum of its proper divisors (25994316).

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

12161340 is a wasteful number, since it uses less digits than its factorization.

12161340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528 (or 7517 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12161340 is about 3487.3112852167. The cubic root of 12161340 is about 229.9643296919.

Adding to 12161340 its reverse (4316121), we get a palindrome (16477461).

It can be divided in two parts, 1216 and 1340, that added together give a triangular number (2556 = T₇₁).

The spelling of 12161340 in words is "twelve million, one hundred sixty-one thousand, three hundred forty".