1209457920 has 432 divisors, whose sum is σ = 4501869120. Its totient is φ = 275742720.

The previous prime is 1209457913. The next prime is 1209457943. The reversal of 1209457920 is 297549021.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 8828092 + ... + 8828228.

Almost surely, 2^1209457920 is an apocalyptic number.

1209457920 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 1209457920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2250934560).

1209457920 is an abundant number, since it is smaller than the sum of its proper divisors (3292411200).

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

1209457920 is a wasteful number, since it uses less digits than its factorization.

1209457920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1209457920 is about 34777.2615368145. The cubic root of 1209457920 is about 1065.4430830633.

The spelling of 1209457920 in words is "one billion, two hundred nine million, four hundred fifty-seven thousand, nine hundred twenty".