647401 has 2 divisors, whose sum is σ = 647402. Its totient is φ = 647400.

The previous prime is 647399. The next prime is 647417. The reversal of 647401 is 104746.

647401 is nontrivially palindromic in base 16.

647401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 15376 = 795^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 647401 - 2¹ = 647399 is a prime.

Together with 647399, it forms a pair of twin primes.

It is a Chen prime.

647401 is a lucky number.

It is equal to p₅₂₆₂₇ and since 647401 and 52627 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (647441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323700 + 323701.

It is an arithmetic number, because the mean of its divisors is an integer number (323701).

2⁶⁴⁷⁴⁰¹ is an apocalyptic number.

It is an amenable number.

647401 is a deficient number, since it is larger than the sum of its proper divisors (1).

647401 is an equidigital number, since it uses as much as digits as its factorization.

647401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 647401 is about 804.6123290132. The cubic root of 647401 is about 86.5083021869.

The spelling of 647401 in words is "six hundred forty-seven thousand, four hundred one".