4393969 has 2 divisors, whose sum is σ = 4393970. Its totient is φ = 4393968.

The previous prime is 4393967. The next prime is 4393979. The reversal of 4393969 is 9693934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4359744 + 34225 = 2088^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 4393969 - 2¹ = 4393967 is a prime.

It is a super-2 number, since 2×4393969² = 38613927145922, which contains 22 as substring.

Together with 4393967, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 4¹¹ + 3⁹ + 9² + 3¹¹ + 9³ + 6⁴ + 9³ .

4393969 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4393967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2196984 + 2196985.

It is an arithmetic number, because the mean of its divisors is an integer number (2196985).

Almost surely, 2^4393969 is an apocalyptic number.

It is an amenable number.

4393969 is a deficient number, since it is larger than the sum of its proper divisors (1).

4393969 is an equidigital number, since it uses as much as digits as its factorization.

4393969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 43.

The square root of 4393969 is about 2096.1796201662. The cubic root of 4393969 is about 163.7893513025.

The spelling of 4393969 in words is "four million, three hundred ninety-three thousand, nine hundred sixty-nine".