1220433550 has 24 divisors (see below), whose sum is σ = 2594293776. Its totient is φ = 418434240.

The previous prime is 1220433523. The next prime is 1220433559. The reversal of 1220433550 is 553340221.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220433559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1743127 + ... + 1743826.

It is an arithmetic number, because the mean of its divisors is an integer number (108095574).

Almost surely, 2^1220433550 is an apocalyptic number.

1220433550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220433550 is an abundant number, since it is smaller than the sum of its proper divisors (1373860226).

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

1220433550 is a wasteful number, since it uses less digits than its factorization.

1220433550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486972 (or 3486967 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 1220433550 is about 34934.7040920630. The cubic root of 1220433550 is about 1068.6562892197.

Adding to 1220433550 its reverse (553340221), we get a palindrome (1773773771).

It can be divided in two parts, 12204 and 33550, that added together give a palindrome (45754).

The spelling of 1220433550 in words is "one billion, two hundred twenty million, four hundred thirty-three thousand, five hundred fifty".