12161405 has 8 divisors (see below), whose sum is σ = 14758200. Its totient is φ = 9619456.

The previous prime is 12161351. The next prime is 12161417. The reversal of 12161405 is 50416121.

It can be written as a sum of positive squares in 4 ways, for example, as 252004 + 11909401 = 502^2 + 3451^2 .

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 12161405 - 2¹⁰ = 12160381 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13220 + ... + 14109.

It is an arithmetic number, because the mean of its divisors is an integer number (1844775).

Almost surely, 2^12161405 is an apocalyptic number.

It is an amenable number.

12161405 is a deficient number, since it is larger than the sum of its proper divisors (2596795).

12161405 is an equidigital number, since it uses as much as digits as its factorization.

12161405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27423.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 12161405 is about 3487.3206047050. The cubic root of 12161405 is about 229.9647393961.

Adding to 12161405 its reverse (50416121), we get a palindrome (62577526).

The spelling of 12161405 in words is "twelve million, one hundred sixty-one thousand, four hundred five".