1209420000 has 180 divisors, whose sum is σ = 4298374080. Its totient is φ = 322464000.

The previous prime is 1209419989. The next prime is 1209420029. The reversal of 1209420000 is 249021.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 176641 + ... + 183359.

It is an arithmetic number, because the mean of its divisors is an integer number (23879856).

Almost surely, 2^1209420000 is an apocalyptic number.

1209420000 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 1209420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149187040).

1209420000 is an abundant number, since it is smaller than the sum of its proper divisors (3088954080).

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

1209420000 is an equidigital number, since it uses as much as digits as its factorization.

1209420000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6755 (or 6729 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1209420000 is about 34776.7163487296. The cubic root of 1209420000 is about 1065.4319480406.

Adding to 1209420000 its reverse (249021), we get a palindrome (1209669021).

The spelling of 1209420000 in words is "one billion, two hundred nine million, four hundred twenty thousand".