1220235840 has 280 divisors, whose sum is σ = 4381439040. Its totient is φ = 322348032.

The previous prime is 1220235833. The next prime is 1220235851. The reversal of 1220235840 is 485320221.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4639549 + ... + 4639811.

Almost surely, 2^1220235840 is an apocalyptic number.

1220235840 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 1220235840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190719520).

1220235840 is an abundant number, since it is smaller than the sum of its proper divisors (3161203200).

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

1220235840 is a wasteful number, since it uses less digits than its factorization.

1220235840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1220235840 is about 34931.8742697840. The cubic root of 1220235840 is about 1068.5985787322.

The spelling of 1220235840 in words is "one billion, two hundred twenty million, two hundred thirty-five thousand, eight hundred forty".