1225666 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 512256.

The previous prime is 1225663. The next prime is 1225687. The reversal of 1225666 is 6665221.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20745 + ... + 20803.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1225666 is an apocalyptic number.

1225666 is a deficient number, since it is larger than the sum of its proper divisors (951614).

1225666 is a wasteful number, since it uses less digits than its factorization.

1225666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138.

The product of its digits is 4320, while the sum is 28.

The square root of 1225666 is about 1107.0980083082. The cubic root of 1225666 is about 107.0181353370.

It can be divided in two parts, 1225 and 666, that added together give a triangular number (1891 = T₆₁).

The spelling of 1225666 in words is "one million, two hundred twenty-five thousand, six hundred sixty-six".