1231200120 has 64 divisors (see below), whose sum is σ = 3854200320. Its totient is φ = 314044544.

The previous prime is 1231200119. The next prime is 1231200151. The reversal of 1231200120 is 210021321.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1231200096 and 1231200105.

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, 220284 + ... + 225803.

It is an arithmetic number, because the mean of its divisors is an integer number (60221880).

Almost surely, 2^1231200120 is an apocalyptic number.

1231200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231200120 is an abundant number, since it is smaller than the sum of its proper divisors (2623000200).

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

1231200120 is a wasteful number, since it uses less digits than its factorization.

1231200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446124 (or 446120 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1231200120 is about 35088.4613512761. The cubic root of 1231200120 is about 1071.7896274458.

Adding to 1231200120 its reverse (210021321), we get a palindrome (1441221441).

The spelling of 1231200120 in words is "one billion, two hundred thirty-one million, two hundred thousand, one hundred twenty".