1278522 has 48 divisors (see below), whose sum is σ = 3232320. Its totient is φ = 357696.

The previous prime is 1278493. The next prime is 1278527. The reversal of 1278522 is 2258721.

Its product of digits (2240) is a multiple of the sum of its prime divisors (224).

It is not an unprimeable number, because it can be changed into a prime (1278527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9129 + ... + 9267.

It is an arithmetic number, because the mean of its divisors is an integer number (67340).

2^1278522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616160).

1278522 is an abundant number, since it is smaller than the sum of its proper divisors (1953798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278522 is a wasteful number, since it uses less digits than its factorization.

1278522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 224 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 1278522 is about 1130.7174713429. The cubic root of 1278522 is about 108.5348978472.

It can be divided in two parts, 127 and 8522, that added together give a square (8649 = 93²).

The spelling of 1278522 in words is "one million, two hundred seventy-eight thousand, five hundred twenty-two".