725204123 has 4 divisors (see below), whose sum is σ = 828804720. Its totient is φ = 621603528.

The previous prime is 725204113. The next prime is 725204149. The reversal of 725204123 is 321402527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321402527 = 17 ⋅18906031.

It is not a de Polignac number, because 725204123 - 2⁶ = 725204059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 725204092 and 725204101.

It is not an unprimeable number, because it can be changed into a prime (725204113) 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, 51800288 + ... + 51800301.

It is an arithmetic number, because the mean of its divisors is an integer number (207201180).

Almost surely, 2^725204123 is an apocalyptic number.

725204123 is a deficient number, since it is larger than the sum of its proper divisors (103600597).

725204123 is a wasteful number, since it uses less digits than its factorization.

725204123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103600596.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 725204123 is about 26929.6142378609. The cubic root of 725204123 is about 898.4351915815.

The spelling of 725204123 in words is "seven hundred twenty-five million, two hundred four thousand, one hundred twenty-three".