123402445 has 4 divisors (see below), whose sum is σ = 148082940. Its totient is φ = 98721952.

The previous prime is 123402431. The next prime is 123402467. The reversal of 123402445 is 544204321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544204321 = 139 ⋅3915139.

It can be written as a sum of positive squares in 2 ways, for example, as 31606884 + 91795561 = 5622^2 + 9581^2 .

It is a cyclic number.

It is not a de Polignac number, because 123402445 - 2⁹ = 123401933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12340240 + ... + 12340249.

It is an arithmetic number, because the mean of its divisors is an integer number (37020735).

Almost surely, 2^123402445 is an apocalyptic number.

It is an amenable number.

123402445 is a deficient number, since it is larger than the sum of its proper divisors (24680495).

123402445 is an equidigital number, since it uses as much as digits as its factorization.

123402445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24680494.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 123402445 is about 11108.6653113684. The cubic root of 123402445 is about 497.8607872571.

Adding to 123402445 its reverse (544204321), we get a palindrome (667606766).

The spelling of 123402445 in words is "one hundred twenty-three million, four hundred two thousand, four hundred forty-five".