1031200120 has 64 divisors (see below), whose sum is σ = 2434487040. Its totient is φ = 392601600.

The previous prime is 1031200099. The next prime is 1031200133. The reversal of 1031200120 is 210021301.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1031200097 and 1031200106.

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, 68824 + ... + 82456.

It is an arithmetic number, because the mean of its divisors is an integer number (38038860).

Almost surely, 2^1031200120 is an apocalyptic number.

1031200120 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 1031200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1217243520).

1031200120 is an abundant number, since it is smaller than the sum of its proper divisors (1403286920).

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

1031200120 is a wasteful number, since it uses less digits than its factorization.

1031200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13736 (or 13732 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1031200120 is about 32112.3048067248. The cubic root of 1031200120 is about 1010.2937158382.

Adding to 1031200120 its reverse (210021301), we get a palindrome (1241221421).

The spelling of 1031200120 in words is "one billion, thirty-one million, two hundred thousand, one hundred twenty".