123594721 has 6 divisors (see below), whose sum is σ = 124258722. Its totient is φ = 122934240.

The previous prime is 123594707. The next prime is 123594739. The reversal of 123594721 is 127495321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 60233121 = 7960^2 + 7761^2 .

It is not a de Polignac number, because 123594721 - 2¹⁹ = 123070433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123594761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38041 + ... + 41161.

It is an arithmetic number, because the mean of its divisors is an integer number (20709787).

Almost surely, 2^123594721 is an apocalyptic number.

It is an amenable number.

123594721 is a deficient number, since it is larger than the sum of its proper divisors (664001).

123594721 is an frugal number, since it uses more digits than its factorization.

123594721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519 (or 3320 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 123594721 is about 11117.3162678769. The cubic root of 123594721 is about 498.1192289376.

The spelling of 123594721 in words is "one hundred twenty-three million, five hundred ninety-four thousand, seven hundred twenty-one".