1220581380 has 48 divisors (see below), whose sum is σ = 3475563840. Its totient is φ = 319970688.

The previous prime is 1220581339. The next prime is 1220581381. The reversal of 1220581380 is 831850221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1220581381) 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, 168859 + ... + 175938.

It is an arithmetic number, because the mean of its divisors is an integer number (72407580).

Almost surely, 2^1220581380 is an apocalyptic number.

1220581380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220581380 is an abundant number, since it is smaller than the sum of its proper divisors (2254982460).

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

1220581380 is a wasteful number, since it uses less digits than its factorization.

1220581380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344868 (or 344866 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1220581380 is about 34936.8198323774. The cubic root of 1220581380 is about 1068.6994359307.

The spelling of 1220581380 in words is "one billion, two hundred twenty million, five hundred eighty-one thousand, three hundred eighty".