724904123 has 4 divisors (see below), whose sum is σ = 767545560. Its totient is φ = 682262688.

The previous prime is 724904119. The next prime is 724904129. The reversal of 724904123 is 321409427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321409427 = 61 ⋅5269007.

It is a cyclic number.

It is not a de Polignac number, because 724904123 - 2² = 724904119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 724904123.

It is not an unprimeable number, because it can be changed into a prime (724904129) 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, 21320693 + ... + 21320726.

It is an arithmetic number, because the mean of its divisors is an integer number (191886390).

Almost surely, 2^724904123 is an apocalyptic number.

724904123 is a deficient number, since it is larger than the sum of its proper divisors (42641437).

724904123 is a wasteful number, since it uses less digits than its factorization.

724904123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42641436.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 724904123 is about 26924.0435856132. The cubic root of 724904123 is about 898.3112872794.

The spelling of 724904123 in words is "seven hundred twenty-four million, nine hundred four thousand, one hundred twenty-three".