647445399 has 8 divisors (see below), whose sum is σ = 877412592. Its totient is φ = 424554240.

The previous prime is 647445389. The next prime is 647445413. The reversal of 647445399 is 993544746.

It is a happy number.

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

It is not a de Polignac number, because 647445399 - 2¹² = 647441303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647445389) 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, 1768794 + ... + 1769159.

It is an arithmetic number, because the mean of its divisors is an integer number (109676574).

Almost surely, 2^647445399 is an apocalyptic number.

647445399 is a deficient number, since it is larger than the sum of its proper divisors (229967193).

647445399 is a wasteful number, since it uses less digits than its factorization.

647445399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538017.

The product of its digits is 3265920, while the sum is 51.

The square root of 647445399 is about 25444.9483984543. The cubic root of 647445399 is about 865.1027973211.

The spelling of 647445399 in words is "six hundred forty-seven million, four hundred forty-five thousand, three hundred ninety-nine".