1200840640 has 56 divisors (see below), whose sum is σ = 2867741280. Its totient is φ = 478952448.

The previous prime is 1200840623. The next prime is 1200840673. The reversal of 1200840640 is 460480021.

1200840640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×1200840640³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109654 + ... + 120106.

Almost surely, 2^1200840640 is an apocalyptic number.

1200840640 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 1200840640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433870640).

1200840640 is an abundant number, since it is smaller than the sum of its proper divisors (1666900640).

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

1200840640 is a wasteful number, since it uses less digits than its factorization.

1200840640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10829 (or 10819 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1200840640 is about 34653.1476203822. The cubic root of 1200840640 is about 1062.9066538443.

The spelling of 1200840640 in words is "one billion, two hundred million, eight hundred forty thousand, six hundred forty".