3897409 has 2 divisors, whose sum is σ = 3897410. Its totient is φ = 3897408.

The previous prime is 3897407. The next prime is 3897449. The reversal of 3897409 is 9047983.

3897409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (3897449) can be obtained adding 3897409 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2259009 + 1638400 = 1503^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3897409 - 2¹ = 3897407 is a prime.

Together with 3897407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3897401) 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, 1948704 + 1948705.

It is an arithmetic number, because the mean of its divisors is an integer number (1948705).

Almost surely, 2^3897409 is an apocalyptic number.

It is an amenable number.

3897409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3897409 is an equidigital number, since it uses as much as digits as its factorization.

3897409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3897409 is about 1974.1856548967. The cubic root of 3897409 is about 157.3712258910.

The spelling of 3897409 in words is "three million, eight hundred ninety-seven thousand, four hundred nine".