1200100320 has 192 divisors, whose sum is σ = 4252227840. Its totient is φ = 316076544.

The previous prime is 1200100273. The next prime is 1200100331. The reversal of 1200100320 is 230010021.

1200100320 = T₅₃₃₆ + T₅₃₃₇ + ... + T₅₄₁₈.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356887 + ... + 360233.

It is an arithmetic number, because the mean of its divisors is an integer number (22147020).

Almost surely, 2^1200100320 is an apocalyptic number.

1200100320 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 1200100320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2126113920).

1200100320 is an abundant number, since it is smaller than the sum of its proper divisors (3052127520).

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

1200100320 is a wasteful number, since it uses less digits than its factorization.

1200100320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454 (or 3440 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1200100320 is about 34642.4641155909. The cubic root of 1200100320 is about 1062.6881811096.

Adding to 1200100320 its reverse (230010021), we get a palindrome (1430110341).

The spelling of 1200100320 in words is "one billion, two hundred million, one hundred thousand, three hundred twenty".