1550220 has 48 divisors (see below), whose sum is σ = 4962048. Its totient is φ = 354240.

The previous prime is 1550209. The next prime is 1550221. The reversal of 1550220 is 220551.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1550220.

It is not an unprimeable number, because it can be changed into a prime (1550221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (103376).

2^1550220 is an apocalyptic number.

1550220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1550220 is an abundant number, since it is smaller than the sum of its proper divisors (3411828).

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

1550220 is a wasteful number, since it uses less digits than its factorization.

1550220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710 (or 3708 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1550220 is about 1245.0783107901. The cubic root of 1550220 is about 115.7349278392.

Adding to 1550220 its reverse (220551), we get a palindrome (1770771).

It can be divided in two parts, 1550 and 220, that added together give a triangular number (1770 = T₅₉).

The spelling of 1550220 in words is "one million, five hundred fifty thousand, two hundred twenty".