12401555 has 4 divisors (see below), whose sum is σ = 14881872. Its totient is φ = 9921240.

The previous prime is 12401539. The next prime is 12401563. The reversal of 12401555 is 55510421.

It is a happy number.

12401555 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 55510421 = 2393 ⋅23197.

It is not a de Polignac number, because 12401555 - 2⁴ = 12401539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12401555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240151 + ... + 1240160.

It is an arithmetic number, because the mean of its divisors is an integer number (3720468).

Almost surely, 2^12401555 is an apocalyptic number.

12401555 is a deficient number, since it is larger than the sum of its proper divisors (2480317).

12401555 is an equidigital number, since it uses as much as digits as its factorization.

12401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480316.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 12401555 is about 3521.5841605732. The cubic root of 12401555 is about 231.4685802793.

Adding to 12401555 its reverse (55510421), we get a palindrome (67911976).

The spelling of 12401555 in words is "twelve million, four hundred one thousand, five hundred fifty-five".