1220237840 has 20 divisors (see below), whose sum is σ = 2837053164. Its totient is φ = 488095104.

The previous prime is 1220237831. The next prime is 1220237857. The reversal of 1220237840 is 487320221.

It can be written as a sum of positive squares in 2 ways, for example, as 773507344 + 446730496 = 27812^2 + 21136^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7626407 + ... + 7626566.

Almost surely, 2^1220237840 is an apocalyptic number.

1220237840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220237840 is an abundant number, since it is smaller than the sum of its proper divisors (1616815324).

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

1220237840 is a wasteful number, since it uses less digits than its factorization.

1220237840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15252986 (or 15252980 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 1220237840 is about 34931.9028969222. The cubic root of 1220237840 is about 1068.5991625527.

The spelling of 1220237840 in words is "one billion, two hundred twenty million, two hundred thirty-seven thousand, eight hundred forty".