12278461 has 4 divisors (see below), whose sum is σ = 13222972. Its totient is φ = 11333952.

The previous prime is 12278447. The next prime is 12278473. The reversal of 12278461 is 16487221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16487221 = 79 ⋅208699.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 6661561 = 2370^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 12278461 - 2⁵ = 12278429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278491) 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, 472236 + ... + 472261.

It is an arithmetic number, because the mean of its divisors is an integer number (3305743).

Almost surely, 2^12278461 is an apocalyptic number.

It is an amenable number.

12278461 is a deficient number, since it is larger than the sum of its proper divisors (944511).

12278461 is an equidigital number, since it uses as much as digits as its factorization.

12278461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944510.

The product of its digits is 5376, while the sum is 31.

The square root of 12278461 is about 3504.0634982831. The cubic root of 12278461 is about 230.7002039048.

The spelling of 12278461 in words is "twelve million, two hundred seventy-eight thousand, four hundred sixty-one".