1204649 has 2 divisors, whose sum is σ = 1204650. Its totient is φ = 1204648.

The previous prime is 1204633. The next prime is 1204669. The reversal of 1204649 is 9464021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194649 + 10000 = 1093^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204649 - 2⁴ = 1204633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₉₃₂₅₇ and since 1204649 and 93257 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602324 + 602325.

It is an arithmetic number, because the mean of its divisors is an integer number (602325).

2^1204649 is an apocalyptic number.

It is an amenable number.

1204649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204649 is an equidigital number, since it uses as much as digits as its factorization.

1204649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1204649 is about 1097.5650322418. The cubic root of 1204649 is about 106.4029106276.

The spelling of 1204649 in words is "one million, two hundred four thousand, six hundred forty-nine".