123645243 has 4 divisors (see below), whose sum is σ = 164860328. Its totient is φ = 82430160.

The previous prime is 123645229. The next prime is 123645259. The reversal of 123645243 is 342546321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123645243 - 2⁴ = 123645227 is a prime.

It is a super-2 number, since 2×123645243² = 30576292233058098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123645243.

It is not an unprimeable number, because it can be changed into a prime (123645943) 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, 20607538 + ... + 20607543.

It is an arithmetic number, because the mean of its divisors is an integer number (41215082).

Almost surely, 2^123645243 is an apocalyptic number.

123645243 is a deficient number, since it is larger than the sum of its proper divisors (41215085).

123645243 is an equidigital number, since it uses as much as digits as its factorization.

123645243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41215084.

The product of its digits is 17280, while the sum is 30.

The square root of 123645243 is about 11119.5882567656. The cubic root of 123645243 is about 498.1870920070.

The spelling of 123645243 in words is "one hundred twenty-three million, six hundred forty-five thousand, two hundred forty-three".