724919 has 4 divisors (see below), whose sum is σ = 780696. Its totient is φ = 669144.

The previous prime is 724903. The next prime is 724939. The reversal of 724919 is 919427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 724919 - 2⁴ = 724903 is a prime.

It is a super-2 number, since 2×724919² = 1051015113122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27869 + ... + 27894.

It is an arithmetic number, because the mean of its divisors is an integer number (195174).

2⁷²⁴⁹¹⁹ is an apocalyptic number.

724919 is a deficient number, since it is larger than the sum of its proper divisors (55777).

724919 is a wasteful number, since it uses less digits than its factorization.

724919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55776.

The product of its digits is 4536, while the sum is 32.

The square root of 724919 is about 851.4217521299. The cubic root of 724919 is about 89.8317432499.

It can be divided in two parts, 7249 and 19, that multiplied together give a palindrome (137731).

The spelling of 724919 in words is "seven hundred twenty-four thousand, nine hundred nineteen".