1550406 has 48 divisors (see below), whose sum is σ = 3689280. Its totient is φ = 430560.

The previous prime is 1550401. The next prime is 1550413. The reversal of 1550406 is 6040551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550401) 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, 11085 + ... + 11223.

It is an arithmetic number, because the mean of its divisors is an integer number (76860).

2^1550406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1550406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1844640).

1550406 is an abundant number, since it is smaller than the sum of its proper divisors (2138874).

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

1550406 is a wasteful number, since it uses less digits than its factorization.

1550406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1550406 is about 1245.1530026467. The cubic root of 1550406 is about 115.7395563942.

Adding to 1550406 its reverse (6040551), we get a palindrome (7590957).

The spelling of 1550406 in words is "one million, five hundred fifty thousand, four hundred six".