1205721532 has 24 divisors (see below), whose sum is σ = 2351719440. Its totient is φ = 537534720.

The previous prime is 1205721521. The next prime is 1205721599. The reversal of 1205721532 is 2351275021.

It is a self number, because there is not a number n which added to its sum of digits gives 1205721532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465319 + ... + 467902.

It is an arithmetic number, because the mean of its divisors is an integer number (97988310).

Almost surely, 2^1205721532 is an apocalyptic number.

It is an amenable number.

1205721532 is a deficient number, since it is larger than the sum of its proper divisors (1145997908).

1205721532 is a wasteful number, since it uses less digits than its factorization.

1205721532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933261 (or 933259 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1205721532 is about 34723.5011483577. The cubic root of 1205721532 is about 1064.3447906927.

Adding to 1205721532 its reverse (2351275021), we get a palindrome (3556996553).

The spelling of 1205721532 in words is "one billion, two hundred five million, seven hundred twenty-one thousand, five hundred thirty-two".