1225578 has 32 divisors (see below), whose sum is σ = 2612736. Its totient is φ = 382448.

The previous prime is 1225577. The next prime is 1225579. The reversal of 1225578 is 8755221.

It is an interprime number because it is at equal distance from previous prime (1225577) and next prime (1225579).

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225571) 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 in 15 ways as a sum of consecutive naturals, for example, 11401 + ... + 11507.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2^1225578 is an apocalyptic number.

1225578 is an abundant number, since it is smaller than the sum of its proper divisors (1387158).

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

1225578 is a wasteful number, since it uses less digits than its factorization.

1225578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218.

The product of its digits is 5600, while the sum is 30.

The square root of 1225578 is about 1107.0582640494. The cubic root of 1225578 is about 107.0155740570.

It can be divided in two parts, 12 and 25578, that multiplied together give a triangular number (306936 = T₇₈₃).

The spelling of 1225578 in words is "one million, two hundred twenty-five thousand, five hundred seventy-eight".