647474389 has 4 divisors (see below), whose sum is σ = 650543200. Its totient is φ = 644405580.

The previous prime is 647474383. The next prime is 647474413. The reversal of 647474389 is 983474746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647474389 - 2⁹ = 647473877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647474383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534089 + ... + 1534510.

It is an arithmetic number, because the mean of its divisors is an integer number (162635800).

Almost surely, 2^647474389 is an apocalyptic number.

It is an amenable number.

647474389 is a deficient number, since it is larger than the sum of its proper divisors (3068811).

647474389 is a wasteful number, since it uses less digits than its factorization.

647474389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068810.

The product of its digits is 4064256, while the sum is 52.

The square root of 647474389 is about 25445.5180532840. The cubic root of 647474389 is about 865.1157090693.

The spelling of 647474389 in words is "six hundred forty-seven million, four hundred seventy-four thousand, three hundred eighty-nine".