1209490920 has 256 divisors, whose sum is σ = 4472928000. Its totient is φ = 288230400.

The previous prime is 1209490913. The next prime is 1209490927. The reversal of 1209490920 is 290949021.

It is an interprime number because it is at equal distance from previous prime (1209490913) and next prime (1209490927).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1209490927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 723846 + ... + 725514.

It is an arithmetic number, because the mean of its divisors is an integer number (17472375).

Almost surely, 2^1209490920 is an apocalyptic number.

1209490920 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 1209490920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236464000).

1209490920 is an abundant number, since it is smaller than the sum of its proper divisors (3263437080).

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

1209490920 is a wasteful number, since it uses less digits than its factorization.

1209490920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1209490920 is about 34777.7359815155. The cubic root of 1209490920 is about 1065.4527731626.

The spelling of 1209490920 in words is "one billion, two hundred nine million, four hundred ninety thousand, nine hundred twenty".