1225689 has 4 divisors (see below), whose sum is σ = 1634256. Its totient is φ = 817124.

The previous prime is 1225687. The next prime is 1225691. The reversal of 1225689 is 9865221.

1225689 = T₃₆₀ + T₃₆₁ + ... + T₃₇₇.

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 an interprime number because it is at equal distance from previous prime (1225687) and next prime (1225691).

It is a cyclic number.

It is not a de Polignac number, because 1225689 - 2¹ = 1225687 is a prime.

It is a D-number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225687) 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, 204279 + ... + 204284.

It is an arithmetic number, because the mean of its divisors is an integer number (408564).

2^1225689 is an apocalyptic number.

It is an amenable number.

1225689 is a deficient number, since it is larger than the sum of its proper divisors (408567).

1225689 is an equidigital number, since it uses as much as digits as its factorization.

1225689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408566.

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

The square root of 1225689 is about 1107.1083957770. The cubic root of 1225689 is about 107.0188047422.

The spelling of 1225689 in words is "one million, two hundred twenty-five thousand, six hundred eighty-nine".