1203921 has 6 divisors (see below), whose sum is σ = 1739010. Its totient is φ = 802608.

The previous prime is 1203919. The next prime is 1203929. The reversal of 1203921 is 1293021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1134225 + 69696 = 1065^2 + 264^2 .

It is not a de Polignac number, because 1203921 - 2¹ = 1203919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1203894 and 1203903.

It is not an unprimeable number, because it can be changed into a prime (1203929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66876 + ... + 66893.

It is an arithmetic number, because the mean of its divisors is an integer number (289835).

2^1203921 is an apocalyptic number.

It is an amenable number.

1203921 is a deficient number, since it is larger than the sum of its proper divisors (535089).

1203921 is a wasteful number, since it uses less digits than its factorization.

1203921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133775 (or 133772 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1203921 is about 1097.2333389029. The cubic root of 1203921 is about 106.3814723143.

Adding to 1203921 its reverse (1293021), we get a palindrome (2496942).

The spelling of 1203921 in words is "one million, two hundred three thousand, nine hundred twenty-one".