403728649 has 9 divisors (see below), whose sum is σ = 410947149. Its totient is φ = 396635820.

The previous prime is 403728643. The next prime is 403728659. The reversal of 403728649 is 946827304.

The square root of 403728649 is 20093.

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

It is not a de Polignac number, because 403728649 - 2⁹ = 403728137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403728643) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1426462 + ... + 1426744.

Almost surely, 2^403728649 is an apocalyptic number.

403728649 is the 20093-rd square number.

403728649 is the 10047-th centered octagonal number.

It is an amenable number.

403728649 is a deficient number, since it is larger than the sum of its proper divisors (7218500).

403728649 is an frugal number, since it uses more digits than its factorization.

403728649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The cubic root of 403728649 is about 739.0886327286.

The spelling of 403728649 in words is "four hundred three million, seven hundred twenty-eight thousand, six hundred forty-nine".