403649 has 2 divisors, whose sum is σ = 403650. Its totient is φ = 403648.

The previous prime is 403621. The next prime is 403661. The reversal of 403649 is 946304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399424 + 4225 = 632^2 + 65^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 403649.

It is not a weakly prime, because it can be changed into another prime (403679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201824 + 201825.

It is an arithmetic number, because the mean of its divisors is an integer number (201825).

2⁴⁰³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

403649 is a deficient number, since it is larger than the sum of its proper divisors (1).

403649 is an equidigital number, since it uses as much as digits as its factorization.

403649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 403649 is about 635.3337705490. Note that the first 3 decimals coincide. The cubic root of 403649 is about 73.9040026202.

The spelling of 403649 in words is "four hundred three thousand, six hundred forty-nine".