123442747 has 4 divisors (see below), whose sum is σ = 123504480. Its totient is φ = 123381016.

The previous prime is 123442721. The next prime is 123442751. The reversal of 123442747 is 747244321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747244321 = 1567 ⋅476863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123442747 is a prime.

It is a super-2 number, since 2×123442747² = 30476223573812018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123442757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27763 + ... + 31900.

It is an arithmetic number, because the mean of its divisors is an integer number (30876120).

Almost surely, 2^123442747 is an apocalyptic number.

123442747 is a deficient number, since it is larger than the sum of its proper divisors (61733).

123442747 is an equidigital number, since it uses as much as digits as its factorization.

123442747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61732.

The product of its digits is 37632, while the sum is 34.

The square root of 123442747 is about 11110.4791525838. The cubic root of 123442747 is about 497.9149801366.

The spelling of 123442747 in words is "one hundred twenty-three million, four hundred forty-two thousand, seven hundred forty-seven".