1201634720 has 192 divisors, whose sum is σ = 3452077440. Its totient is φ = 389222400.

The previous prime is 1201634719. The next prime is 1201634723. The reversal of 1201634720 is 274361021.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1201634720.

It is not an unprimeable number, because it can be changed into a prime (1201634723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 662615 + ... + 664425.

It is an arithmetic number, because the mean of its divisors is an integer number (17979570).

Almost surely, 2^1201634720 is an apocalyptic number.

1201634720 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 1201634720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726038720).

1201634720 is an abundant number, since it is smaller than the sum of its proper divisors (2250442720).

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

1201634720 is a wasteful number, since it uses less digits than its factorization.

1201634720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1201634720 is about 34664.6032719257. The cubic root of 1201634720 is about 1063.1408916805.

Adding to 1201634720 its reverse (274361021), we get a palindrome (1475995741).

The spelling of 1201634720 in words is "one billion, two hundred one million, six hundred thirty-four thousand, seven hundred twenty".