12155457 has 4 divisors (see below), whose sum is σ = 16207280. Its totient is φ = 8103636.

The previous prime is 12155447. The next prime is 12155461. The reversal of 12155457 is 75455121.

12155457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12155457 - 2¹⁸ = 11893313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12155447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025907 + ... + 2025912.

It is an arithmetic number, because the mean of its divisors is an integer number (4051820).

Almost surely, 2^12155457 is an apocalyptic number.

It is an amenable number.

12155457 is a deficient number, since it is larger than the sum of its proper divisors (4051823).

12155457 is an equidigital number, since it uses as much as digits as its factorization.

12155457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051822.

The product of its digits is 7000, while the sum is 30.

The square root of 12155457 is about 3486.4676966810. The cubic root of 12155457 is about 229.9272422668.

The spelling of 12155457 in words is "twelve million, one hundred fifty-five thousand, four hundred fifty-seven".