123443691 has 48 divisors (see below), whose sum is σ = 206841600. Its totient is φ = 65093952.

The previous prime is 123443611. The next prime is 123443693. The reversal of 123443691 is 196344321.

It is not a de Polignac number, because 123443691 - 2¹⁰ = 123442667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123443693) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97420 + ... + 98678.

It is an arithmetic number, because the mean of its divisors is an integer number (4309200).

Almost surely, 2^123443691 is an apocalyptic number.

123443691 is a deficient number, since it is larger than the sum of its proper divisors (83397909).

123443691 is a wasteful number, since it uses less digits than its factorization.

123443691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1321 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 123443691 is about 11110.5216349189. The cubic root of 123443691 is about 497.9162493635.

The spelling of 123443691 in words is "one hundred twenty-three million, four hundred forty-three thousand, six hundred ninety-one".