1228665 has 16 divisors (see below), whose sum is σ = 1987776. Its totient is φ = 648000.

The previous prime is 1228657. The next prime is 1228679. The reversal of 1228665 is 5668221.

It is not a de Polignac number, because 1228665 - 2³ = 1228657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1110 + ... + 1920.

It is an arithmetic number, because the mean of its divisors is an integer number (124236).

2^1228665 is an apocalyptic number.

1228665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228665 is a deficient number, since it is larger than the sum of its proper divisors (759111).

1228665 is a wasteful number, since it uses less digits than its factorization.

1228665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its digits is 5760, while the sum is 30.

The square root of 1228665 is about 1108.4516227603. The cubic root of 1228665 is about 107.1053494108.

The spelling of 1228665 in words is "one million, two hundred twenty-eight thousand, six hundred sixty-five".