723500381 has 4 divisors (see below), whose sum is σ = 748448700. Its totient is φ = 698552064.

The previous prime is 723500363. The next prime is 723500387. The reversal of 723500381 is 183005327.

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 120012025 + 603488356 = 10955^2 + 24566^2 .

It is a cyclic number.

It is not a de Polignac number, because 723500381 - 2⁶ = 723500317 is a prime.

It is a super-2 number, since 2×723500381² = 1046905602614290322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 24948289 = 723500381 / (7 + 2 + 3 + 5 + 0 + 0 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723500387) 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, 12474116 + ... + 12474173.

It is an arithmetic number, because the mean of its divisors is an integer number (187112175).

Almost surely, 2^723500381 is an apocalyptic number.

It is an amenable number.

723500381 is a deficient number, since it is larger than the sum of its proper divisors (24948319).

723500381 is a wasteful number, since it uses less digits than its factorization.

723500381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24948318.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 723500381 is about 26897.9623949473. The cubic root of 723500381 is about 897.7310670483.

The spelling of 723500381 in words is "seven hundred twenty-three million, five hundred thousand, three hundred eighty-one".