123278645 has 16 divisors (see below), whose sum is σ = 179013888. Its totient is φ = 79560960.

The previous prime is 123278629. The next prime is 123278653. The reversal of 123278645 is 546872321.

It is a happy number.

It is not a de Polignac number, because 123278645 - 2⁴ = 123278629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123278599 and 123278608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103001 + ... + 104190.

It is an arithmetic number, because the mean of its divisors is an integer number (11188368).

Almost surely, 2^123278645 is an apocalyptic number.

It is an amenable number.

123278645 is a deficient number, since it is larger than the sum of its proper divisors (55735243).

123278645 is a wasteful number, since it uses less digits than its factorization.

123278645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207220.

The product of its digits is 80640, while the sum is 38.

The square root of 123278645 is about 11103.0916865529. The cubic root of 123278645 is about 497.6942433170.

The spelling of 123278645 in words is "one hundred twenty-three million, two hundred seventy-eight thousand, six hundred forty-five".