1225869 has 4 divisors (see below), whose sum is σ = 1634496. Its totient is φ = 817244.

The previous prime is 1225849. The next prime is 1225871. The reversal of 1225869 is 9685221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1225869 - 2¹³ = 1217677 is a prime.

It is a super-2 number, since 2×1225869² = 3005509610322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204309 + ... + 204314.

It is an arithmetic number, because the mean of its divisors is an integer number (408624).

2^1225869 is an apocalyptic number.

It is an amenable number.

1225869 is a deficient number, since it is larger than the sum of its proper divisors (408627).

1225869 is an equidigital number, since it uses as much as digits as its factorization.

1225869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408626.

The product of its digits is 8640, while the sum is 33.

The square root of 1225869 is about 1107.1896856456. The cubic root of 1225869 is about 107.0240432766.

The spelling of 1225869 in words is "one million, two hundred twenty-five thousand, eight hundred sixty-nine".