1209072920 has 64 divisors (see below), whose sum is σ = 2976652800. Its totient is φ = 438340480.

The previous prime is 1209072913. The next prime is 1209072983. The reversal of 1209072920 is 292709021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148721 + ... + 156639.

It is an arithmetic number, because the mean of its divisors is an integer number (46510200).

Almost surely, 2^1209072920 is an apocalyptic number.

1209072920 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 1209072920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488326400).

1209072920 is an abundant number, since it is smaller than the sum of its proper divisors (1767579880).

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

1209072920 is a wasteful number, since it uses less digits than its factorization.

1209072920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8288 (or 8284 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1209072920 is about 34771.7258703102. The cubic root of 1209072920 is about 1065.3300188789.

The spelling of 1209072920 in words is "one billion, two hundred nine million, seventy-two thousand, nine hundred twenty".