647381 has 8 divisors (see below), whose sum is σ = 772224. Its totient is φ = 530640.

The previous prime is 647371. The next prime is 647399. The reversal of 647381 is 183746.

647381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 647381 - 2¹⁴ = 630997 is a prime.

It is a super-2 number, since 2×647381² = 838204318322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647381.

It is not an unprimeable number, because it can be changed into a prime (647321) 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, 1850 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (96528).

2⁶⁴⁷³⁸¹ is an apocalyptic number.

It is an amenable number.

647381 is a deficient number, since it is larger than the sum of its proper divisors (124843).

647381 is a wasteful number, since it uses less digits than its factorization.

647381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051.

The product of its digits is 4032, while the sum is 29.

The square root of 647381 is about 804.5999005717. The cubic root of 647381 is about 86.5074113511.

The spelling of 647381 in words is "six hundred forty-seven thousand, three hundred eighty-one".