742726009 has 3 divisors (see below), whose sum is σ = 742753263. Its totient is φ = 742698756.

The previous prime is 742726003. The next prime is 742726013. The reversal of 742726009 is 900627247.

It is a happy number.

The square root of 742726009 is 27253.

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 can be written as a sum of positive squares in only one way, i.e., 382789225 + 359936784 = 19565^2 + 18972^2 .

It is not a de Polignac number, because 742726009 - 2²¹ = 740628857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742726003) 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, 13627 + ... + 40879.

It is an arithmetic number, because the mean of its divisors is an integer number (247584421).

Almost surely, 2^742726009 is an apocalyptic number.

742726009 is the 27253-rd square number.

742726009 is the 13627-th centered octagonal number.

It is an amenable number.

742726009 is a deficient number, since it is larger than the sum of its proper divisors (27254).

742726009 is an frugal number, since it uses more digits than its factorization.

742726009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54506 (or 27253 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The cubic root of 742726009 is about 905.6134782064.

The spelling of 742726009 in words is "seven hundred forty-two million, seven hundred twenty-six thousand, nine".