1243020120 has 64 divisors (see below), whose sum is σ = 3758469120. Its totient is φ = 328857984.

The previous prime is 1243020089. The next prime is 1243020187. The reversal of 1243020120 is 210203421.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1243020120.

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, 25542 + ... + 56021.

It is an arithmetic number, because the mean of its divisors is an integer number (58726080).

Almost surely, 2^1243020120 is an apocalyptic number.

1243020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243020120 is an abundant number, since it is smaller than the sum of its proper divisors (2515449000).

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

1243020120 is a wasteful number, since it uses less digits than its factorization.

1243020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81704 (or 81700 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1243020120 is about 35256.4904662957. The cubic root of 1243020120 is about 1075.2085753572.

Adding to 1243020120 its reverse (210203421), we get a palindrome (1453223541).

The spelling of 1243020120 in words is "one billion, two hundred forty-three million, twenty thousand, one hundred twenty".