12155381 has 12 divisors (see below), whose sum is σ = 14199840. Its totient is φ = 10374840.

The previous prime is 12155371. The next prime is 12155387. The reversal of 12155381 is 18355121.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12155381 is a prime.

It is a super-2 number, since 2×12155381² = 295506574510322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12155381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17246 + ... + 17936.

It is an arithmetic number, because the mean of its divisors is an integer number (1183320).

Almost surely, 2^12155381 is an apocalyptic number.

It is an amenable number.

12155381 is a deficient number, since it is larger than the sum of its proper divisors (2044459).

12155381 is an equidigital number, since it uses as much as digits as its factorization.

12155381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1057 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 12155381 is about 3486.4567973804. The cubic root of 12155381 is about 229.9267630717.

The spelling of 12155381 in words is "twelve million, one hundred fifty-five thousand, three hundred eighty-one".