12181407 has 16 divisors (see below), whose sum is σ = 18665472. Its totient is φ = 6922080.

The previous prime is 12181397. The next prime is 12181409. The reversal of 12181407 is 70418121.

It is not a de Polignac number, because 12181407 - 2⁴ = 12181391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2493 + ... + 5529.

It is an arithmetic number, because the mean of its divisors is an integer number (1166592).

Almost surely, 2^12181407 is an apocalyptic number.

12181407 is a deficient number, since it is larger than the sum of its proper divisors (6484065).

12181407 is a wasteful number, since it uses less digits than its factorization.

12181407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 12181407 is about 3490.1872442607. The cubic root of 12181407 is about 230.0907455405.

Adding to 12181407 its reverse (70418121), we get a palindrome (82599528).

The spelling of 12181407 in words is "twelve million, one hundred eighty-one thousand, four hundred seven".