1225536 has 56 divisors (see below), whose sum is σ = 3499104. Its totient is φ = 376320.

The previous prime is 1225529. The next prime is 1225541. The reversal of 1225536 is 6355221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a d-powerful number, because it can be written as 1 + 2¹⁴ + 2²⁰ + 5⁶ + 5⁷ + 3¹⁰ + 6⁵ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (62484).

2^1225536 is an apocalyptic number.

1225536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749552).

1225536 is an abundant number, since it is smaller than the sum of its proper divisors (2273568).

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

1225536 is a wasteful number, since it uses less digits than its factorization.

1225536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 509 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 1225536 is about 1107.0392946955. The cubic root of 1225536 is about 107.0143515847.

The spelling of 1225536 in words is "one million, two hundred twenty-five thousand, five hundred thirty-six".