723187145 has 8 divisors (see below), whose sum is σ = 873649800. Its totient is φ = 574666240.

The previous prime is 723187121. The next prime is 723187159. The reversal of 723187145 is 541781327.

It can be written as a sum of positive squares in 4 ways, for example, as 37847104 + 685340041 = 6152^2 + 26179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-723187145 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 723187099 and 723187108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484616 + ... + 486105.

It is an arithmetic number, because the mean of its divisors is an integer number (109206225).

Almost surely, 2^723187145 is an apocalyptic number.

It is an amenable number.

723187145 is a deficient number, since it is larger than the sum of its proper divisors (150462655).

723187145 is a wasteful number, since it uses less digits than its factorization.

723187145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970875.

The product of its digits is 47040, while the sum is 38.

The square root of 723187145 is about 26892.1390930510. The cubic root of 723187145 is about 897.6014922352.

The spelling of 723187145 in words is "seven hundred twenty-three million, one hundred eighty-seven thousand, one hundred forty-five".