1550556 has 72 divisors (see below), whose sum is σ = 4692240. Its totient is φ = 441504.

The previous prime is 1550551. The next prime is 1550567. The reversal of 1550556 is 6550551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550551) 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, 5146 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2^1550556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1550556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346120).

1550556 is an abundant number, since it is smaller than the sum of its proper divisors (3141684).

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

1550556 is a wasteful number, since it uses less digits than its factorization.

1550556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 1550556 is about 1245.2132347514. The cubic root of 1550556 is about 115.7432888303.

The spelling of 1550556 in words is "one million, five hundred fifty thousand, five hundred fifty-six".