6439397 has 2 divisors, whose sum is σ = 6439398. Its totient is φ = 6439396.

The previous prime is 6439357. The next prime is 6439427. The reversal of 6439397 is 7939346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3511876 + 2927521 = 1874^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 6439397 - 2¹⁰ = 6438373 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁴ + 4⁵ + 3¹³ + 9³ + 3¹⁴ + 9⁵ + 7 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6439327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219698 + 3219699.

It is an arithmetic number, because the mean of its divisors is an integer number (3219699).

Almost surely, 2^6439397 is an apocalyptic number.

It is an amenable number.

6439397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6439397 is an equidigital number, since it uses as much as digits as its factorization.

6439397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 41.

The square root of 6439397 is about 2537.5966976649. The cubic root of 6439397 is about 186.0437423618.

The spelling of 6439397 in words is "six million, four hundred thirty-nine thousand, three hundred ninety-seven".