1225540 has 24 divisors (see below), whose sum is σ = 2663640. Its totient is φ = 473088.

The previous prime is 1225529. The next prime is 1225541. The reversal of 1225540 is 455221.

1225540 = 73² + 74² + ... + 159².

It can be written as a sum of positive squares in 4 ways, for example, as 2304 + 1223236 = 48^2 + 1106^2 .

It is not an unprimeable number, because it can be changed into a prime (1225541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (110985).

2^1225540 is an apocalyptic number.

1225540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225540 is an abundant number, since it is smaller than the sum of its proper divisors (1438100).

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

1225540 is a wasteful number, since it uses less digits than its factorization.

1225540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151 (or 2149 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1225540 is about 1107.0411013147. The cubic root of 1225540 is about 107.0144680119.

It can be divided in two parts, 12 and 25540, that added together give a palindrome (25552).

The spelling of 1225540 in words is "one million, two hundred twenty-five thousand, five hundred forty".