1278633 has 4 divisors (see below), whose sum is σ = 1704848. Its totient is φ = 852420.

The previous prime is 1278631. The next prime is 1278637. The reversal of 1278633 is 3368721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1278633 - 2¹ = 1278631 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278633.

It is not an unprimeable number, because it can be changed into a prime (1278631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213103 + ... + 213108.

It is an arithmetic number, because the mean of its divisors is an integer number (426212).

2^1278633 is an apocalyptic number.

It is an amenable number.

1278633 is a deficient number, since it is larger than the sum of its proper divisors (426215).

1278633 is an equidigital number, since it uses as much as digits as its factorization.

1278633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426214.

The product of its digits is 6048, while the sum is 30.

The square root of 1278633 is about 1130.7665541570. The cubic root of 1278633 is about 108.5380387200.

The spelling of 1278633 in words is "one million, two hundred seventy-eight thousand, six hundred thirty-three".