1209223680 has 320 divisors, whose sum is σ = 4487712768. Its totient is φ = 272056320.

The previous prime is 1209223601. The next prime is 1209223693. The reversal of 1209223680 is 863229021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (320).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4461945 + ... + 4462215.

Almost surely, 2^1209223680 is an apocalyptic number.

1209223680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209223680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243856384).

1209223680 is an abundant number, since it is smaller than the sum of its proper divisors (3278489088).

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

1209223680 is an equidigital number, since it uses as much as digits as its factorization.

1209223680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1209223680 is about 34773.8936560173. The cubic root of 1209223680 is about 1065.3742959102.

The spelling of 1209223680 in words is "one billion, two hundred nine million, two hundred twenty-three thousand, six hundred eighty".