647397394 has 8 divisors (see below), whose sum is σ = 1109824128. Its totient is φ = 277456020.

The previous prime is 647397391. The next prime is 647397409. The reversal of 647397394 is 493793746.

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

It is not an unprimeable number, because it can be changed into a prime (647397391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23121322 + ... + 23121349.

It is an arithmetic number, because the mean of its divisors is an integer number (138728016).

Almost surely, 2^647397394 is an apocalyptic number.

647397394 is a deficient number, since it is larger than the sum of its proper divisors (462426734).

647397394 is a wasteful number, since it uses less digits than its factorization.

647397394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46242680.

The product of its digits is 3429216, while the sum is 52.

The square root of 647397394 is about 25444.0050699570. The cubic root of 647397394 is about 865.0814157054.

The spelling of 647397394 in words is "six hundred forty-seven million, three hundred ninety-seven thousand, three hundred ninety-four".