1243203120 has 80 divisors (see below), whose sum is σ = 4282151520. Its totient is φ = 331520256.

The previous prime is 1243203109. The next prime is 1243203173. The reversal of 1243203120 is 213023421.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1243203093 and 1243203102.

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, 285619 + ... + 289938.

It is an arithmetic number, because the mean of its divisors is an integer number (53526894).

Almost surely, 2^1243203120 is an apocalyptic number.

1243203120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243203120 is an abundant number, since it is smaller than the sum of its proper divisors (3038948400).

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

1243203120 is a wasteful number, since it uses less digits than its factorization.

1243203120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575579 (or 575567 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1243203120 is about 35259.0856376055. The cubic root of 1243203120 is about 1075.2613375802.

Adding to 1243203120 its reverse (213023421), we get a palindrome (1456226541).

The spelling of 1243203120 in words is "one billion, two hundred forty-three million, two hundred three thousand, one hundred twenty".