1252778 has 4 divisors (see below), whose sum is σ = 1879170. Its totient is φ = 626388.

The previous prime is 1252777. The next prime is 1252799. The reversal of 1252778 is 8772521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772521 = 137 ⋅64033.

It can be written as a sum of positive squares in only one way, i.e., 908209 + 344569 = 953^2 + 587^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1252777) 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, 313193 + ... + 313196.

2^1252778 is an apocalyptic number.

1252778 is a deficient number, since it is larger than the sum of its proper divisors (626392).

1252778 is an equidigital number, since it uses as much as digits as its factorization.

1252778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626391.

The product of its digits is 7840, while the sum is 32.

The square root of 1252778 is about 1119.2756586293. The cubic root of 1252778 is about 107.8014757194.

It can be divided in two parts, 12 and 52778, that multiplied together give a palindrome (633336).

The spelling of 1252778 in words is "one million, two hundred fifty-two thousand, seven hundred seventy-eight".