3648391 has 2 divisors, whose sum is σ = 3648392. Its totient is φ = 3648390.

The previous prime is 3648343. The next prime is 3648409. The reversal of 3648391 is 1938463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3648391 - 2⁷ = 3648263 is a prime.

It is equal to p₂₅₉₉₆₃ and since 3648391 and 259963 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3648301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1824195 + 1824196.

It is an arithmetic number, because the mean of its divisors is an integer number (1824196).

Almost surely, 2^3648391 is an apocalyptic number.

3648391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3648391 is an equidigital number, since it uses as much as digits as its factorization.

3648391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 3648391 is about 1910.0761764914. The cubic root of 3648391 is about 153.9455449228.

The spelling of 3648391 in words is "three million, six hundred forty-eight thousand, three hundred ninety-one".