1205523428 has 6 divisors (see below), whose sum is σ = 2109666006. Its totient is φ = 602761712.

The previous prime is 1205523427. The next prime is 1205523461. The reversal of 1205523428 is 8243255021.

It can be written as a sum of positive squares in only one way, i.e., 1193840704 + 11682724 = 34552^2 + 3418^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1205523394 and 1205523403.

It is not an unprimeable number, because it can be changed into a prime (1205523427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 150690425 + ... + 150690432.

It is an arithmetic number, because the mean of its divisors is an integer number (351611001).

Almost surely, 2^1205523428 is an apocalyptic number.

It is an amenable number.

1205523428 is a deficient number, since it is larger than the sum of its proper divisors (904142578).

1205523428 is a wasteful number, since it uses less digits than its factorization.

1205523428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301380861 (or 301380859 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 1205523428 is about 34720.6484386453. The cubic root of 1205523428 is about 1064.2864957206.

Adding to 1205523428 its reverse (8243255021), we get a palindrome (9448778449).

The spelling of 1205523428 in words is "one billion, two hundred five million, five hundred twenty-three thousand, four hundred twenty-eight".