1201232720 has 40 divisors (see below), whose sum is σ = 2798556000. Its totient is φ = 479514240.

The previous prime is 1201232717. The next prime is 1201232723. The reversal of 1201232720 is 272321021.

It is an interprime number because it is at equal distance from previous prime (1201232717) and next prime (1201232723).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1201232692 and 1201232701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201232723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24875 + ... + 54965.

It is an arithmetic number, because the mean of its divisors is an integer number (69963900).

Almost surely, 2^1201232720 is an apocalyptic number.

1201232720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201232720 is an abundant number, since it is smaller than the sum of its proper divisors (1597323280).

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

1201232720 is a wasteful number, since it uses less digits than its factorization.

1201232720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30603 (or 30597 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1201232720 is about 34658.8043648364. The cubic root of 1201232720 is about 1063.0223225625.

Adding to 1201232720 its reverse (272321021), we get a palindrome (1473553741).

The spelling of 1201232720 in words is "one billion, two hundred one million, two hundred thirty-two thousand, seven hundred twenty".