1220533040 has 20 divisors (see below), whose sum is σ = 2837739504. Its totient is φ = 488213184.

The previous prime is 1220533031. The next prime is 1220533043. The reversal of 1220533040 is 403350221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1220533043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7628252 + ... + 7628411.

Almost surely, 2^1220533040 is an apocalyptic number.

1220533040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220533040 is an abundant number, since it is smaller than the sum of its proper divisors (1617206464).

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

1220533040 is a wasteful number, since it uses less digits than its factorization.

1220533040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15256676 (or 15256670 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1220533040 is about 34936.1280052613. The cubic root of 1220533040 is about 1068.6853274592.

Adding to 1220533040 its reverse (403350221), we get a palindrome (1623883261).

The spelling of 1220533040 in words is "one billion, two hundred twenty million, five hundred thirty-three thousand, forty".