123402040145 has 4 divisors (see below), whose sum is σ = 148082448180. Its totient is φ = 98721632112.

The previous prime is 123402040117. The next prime is 123402040187. The reversal of 123402040145 is 541040204321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541040204321 = 641 ⋅844056481.

It can be written as a sum of positive squares in 2 ways, for example, as 76706287681 + 46695752464 = 276959^2 + 216092^2 .

It is a cyclic number.

It is not a de Polignac number, because 123402040145 - 2⁸ = 123402039889 is a prime.

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, 12340204010 + ... + 12340204019.

It is an arithmetic number, because the mean of its divisors is an integer number (37020612045).

Almost surely, 2^123402040145 is an apocalyptic number.

It is an amenable number.

123402040145 is a deficient number, since it is larger than the sum of its proper divisors (24680408035).

123402040145 is an equidigital number, since it uses as much as digits as its factorization.

123402040145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24680408034.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 123402040145 its reverse (541040204321), we get a palindrome (664442244466).

The spelling of 123402040145 in words is "one hundred twenty-three billion, four hundred two million, forty thousand, one hundred forty-five".