723771409 has 3 divisors (see below), whose sum is σ = 723798313. Its totient is φ = 723744506.

The previous prime is 723771359. The next prime is 723771431. The reversal of 723771409 is 904177327.

The square root of 723771409 is 26903.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 723771409 - 2⁷ = 723771281 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723771439) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13452 + ... + 40354.

Almost surely, 2^723771409 is an apocalyptic number.

723771409 is the 26903-rd square number.

723771409 is the 13452-nd centered octagonal number.

It is an amenable number.

723771409 is a deficient number, since it is larger than the sum of its proper divisors (26904).

723771409 is an frugal number, since it uses more digits than its factorization.

723771409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53806 (or 26903 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 40.

The cubic root of 723771409 is about 897.8431517071.

The spelling of 723771409 in words is "seven hundred twenty-three million, seven hundred seventy-one thousand, four hundred nine".