123249643 has 16 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 103657600.

The previous prime is 123249631. The next prime is 123249661. The reversal of 123249643 is 346942321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123249643 - 2⁹ = 123249131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123249599 and 123249608.

It is not an unprimeable number, because it can be changed into a prime (123249683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5448 + ... + 16618.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^123249643 is an apocalyptic number.

123249643 is a deficient number, since it is larger than the sum of its proper divisors (21539477).

123249643 is a wasteful number, since it uses less digits than its factorization.

123249643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11258.

The product of its digits is 31104, while the sum is 34.

The square root of 123249643 is about 11101.7855771043. The cubic root of 123249643 is about 497.6552117921.

The spelling of 123249643 in words is "one hundred twenty-three million, two hundred forty-nine thousand, six hundred forty-three".