1201539744 has 144 divisors (see below), whose sum is σ = 3566384640. Its totient is φ = 397923840.

The previous prime is 1201539737. The next prime is 1201539749. The reversal of 1201539744 is 4479351021.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1201539699 and 1201539708.

It is not an unprimeable number, because it can be changed into a prime (1201539749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1484812 + ... + 1485620.

It is an arithmetic number, because the mean of its divisors is an integer number (24766560).

Almost surely, 2^1201539744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201539744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1783192320).

1201539744 is an abundant number, since it is smaller than the sum of its proper divisors (2364844896).

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

1201539744 is an equidigital number, since it uses as much as digits as its factorization.

1201539744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1201539744 is about 34663.2333171619. The cubic root of 1201539744 is about 1063.1128810802.

The spelling of 1201539744 in words is "one billion, two hundred one million, five hundred thirty-nine thousand, seven hundred forty-four".