1225921 has 8 divisors (see below), whose sum is σ = 1333800. Its totient is φ = 1122048.

The previous prime is 1225919. The next prime is 1225927. The reversal of 1225921 is 1295221.

It can be written as a sum of positive squares in 4 ways, for example, as 790321 + 435600 = 889^2 + 660^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225921 - 2¹ = 1225919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225892 and 1225901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (166725).

2^1225921 is an apocalyptic number.

It is an amenable number.

1225921 is a deficient number, since it is larger than the sum of its proper divisors (107879).

1225921 is a wasteful number, since it uses less digits than its factorization.

1225921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003.

The product of its digits is 360, while the sum is 22.

The square root of 1225921 is about 1107.2131682743. The cubic root of 1225921 is about 107.0255565355.

The spelling of 1225921 in words is "one million, two hundred twenty-five thousand, nine hundred twenty-one".