744657409 has 8 divisors (see below), whose sum is σ = 790953768. Its totient is φ = 698638080.

The previous prime is 744657373. The next prime is 744657427. The reversal of 744657409 is 904756447.

It can be written as a sum of positive squares in 4 ways, for example, as 161290000 + 583367409 = 12700^2 + 24153^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 744657409 - 2⁹ = 744656897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (744357409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63702 + ... + 74479.

It is an arithmetic number, because the mean of its divisors is an integer number (98869221).

Almost surely, 2^744657409 is an apocalyptic number.

It is an amenable number.

744657409 is a deficient number, since it is larger than the sum of its proper divisors (46296359).

744657409 is a wasteful number, since it uses less digits than its factorization.

744657409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138515.

The product of its (nonzero) digits is 846720, while the sum is 46.

The square root of 744657409 is about 27288.4116247172. The cubic root of 744657409 is about 906.3977907270.

The spelling of 744657409 in words is "seven hundred forty-four million, six hundred fifty-seven thousand, four hundred nine".