723749 has 4 divisors (see below), whose sum is σ = 779436. Its totient is φ = 668064.

The previous prime is 723739. The next prime is 723761. The reversal of 723749 is 947327.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 351649 = 610^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 723749 - 2⁸ = 723493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723739) 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, 27824 + ... + 27849.

It is an arithmetic number, because the mean of its divisors is an integer number (194859).

2⁷²³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

723749 is a deficient number, since it is larger than the sum of its proper divisors (55687).

723749 is a wasteful number, since it uses less digits than its factorization.

723749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55686.

The product of its digits is 10584, while the sum is 32.

The square root of 723749 is about 850.7343886314. The cubic root of 723749 is about 89.7833885441.

The spelling of 723749 in words is "seven hundred twenty-three thousand, seven hundred forty-nine".