123640147 has 2 divisors, whose sum is σ = 123640148. Its totient is φ = 123640146.

The previous prime is 123640123. The next prime is 123640211. The reversal of 123640147 is 741046321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123640147 - 2¹⁹ = 123115859 is a prime.

It is not a weakly prime, because it can be changed into another prime (123640547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61820073 + 61820074.

It is an arithmetic number, because the mean of its divisors is an integer number (61820074).

Almost surely, 2^123640147 is an apocalyptic number.

123640147 is a deficient number, since it is larger than the sum of its proper divisors (1).

123640147 is an equidigital number, since it uses as much as digits as its factorization.

123640147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 123640147 is about 11119.3591092293. The cubic root of 123640147 is about 498.1802477046.

Adding to 123640147 its reverse (741046321), we get a palindrome (864686468).

The spelling of 123640147 in words is "one hundred twenty-three million, six hundred forty thousand, one hundred forty-seven".