123700643 has 4 divisors (see below), whose sum is σ = 134946168. Its totient is φ = 112455120.

The previous prime is 123700597. The next prime is 123700651. The reversal of 123700643 is 346007321.

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

It is a cyclic number.

It is not a de Polignac number, because 123700643 - 2⁸ = 123700387 is a prime.

It is a super-2 number, since 2×123700643² = 30603698157226898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123700243) 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, 5622746 + ... + 5622767.

It is an arithmetic number, because the mean of its divisors is an integer number (33736542).

Almost surely, 2^123700643 is an apocalyptic number.

123700643 is a deficient number, since it is larger than the sum of its proper divisors (11245525).

123700643 is a wasteful number, since it uses less digits than its factorization.

123700643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11245524.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 123700643 is about 11122.0790772229. The cubic root of 123700643 is about 498.2614861452.

Adding to 123700643 its reverse (346007321), we get a palindrome (469707964).

The spelling of 123700643 in words is "one hundred twenty-three million, seven hundred thousand, six hundred forty-three".