1220920000 has 140 divisors (see below), whose sum is σ = 3063688056. Its totient is φ = 482560000.

The previous prime is 1220919967. The next prime is 1220920033. The reversal of 1220920000 is 290221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220919967) and next prime (1220920033).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5239884 + ... + 5240116.

Almost surely, 2^1220920000 is an apocalyptic number.

1220920000 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 1220920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531844028).

1220920000 is an abundant number, since it is smaller than the sum of its proper divisors (1842768056).

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

1220920000 is an equidigital number, since it uses as much as digits as its factorization.

1220920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220920000 is about 34941.6656729470. The cubic root of 1220920000 is about 1068.7982548348.

The spelling of 1220920000 in words is "one billion, two hundred twenty million, nine hundred twenty thousand".