12402181 has 8 divisors (see below), whose sum is σ = 13614624. Its totient is φ = 11203920.

The previous prime is 12402179. The next prime is 12402191. The reversal of 12402181 is 18120421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12402181 - 2¹ = 12402179 is a prime.

It is a super-2 number, since 2×12402181² = 307628187113522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12402151) by changing a digit.

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, 1666 + ... + 5251.

It is an arithmetic number, because the mean of its divisors is an integer number (1701828).

Almost surely, 2^12402181 is an apocalyptic number.

12402181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12402181 is a deficient number, since it is larger than the sum of its proper divisors (1212443).

12402181 is a wasteful number, since it uses less digits than its factorization.

12402181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7091.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 12402181 is about 3521.6730399059. The cubic root of 12402181 is about 231.4724748687.

The spelling of 12402181 in words is "twelve million, four hundred two thousand, one hundred eighty-one".