1227999 has 4 divisors (see below), whose sum is σ = 1637336. Its totient is φ = 818664.

The previous prime is 1227983. The next prime is 1228001. The reversal of 1227999 is 9997221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1227999 - 2⁴ = 1227983 is a prime.

It is a D-number.

It is a Duffinian number.

1227999 is a lucky number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1227929) 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, 204664 + ... + 204669.

It is an arithmetic number, because the mean of its divisors is an integer number (409334).

2^1227999 is an apocalyptic number.

1227999 is a deficient number, since it is larger than the sum of its proper divisors (409337).

1227999 is an equidigital number, since it uses as much as digits as its factorization.

1227999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409336.

The product of its digits is 20412, while the sum is 39.

The square root of 1227999 is about 1108.1511629737. The cubic root of 1227999 is about 107.0859936995.

The spelling of 1227999 in words is "one million, two hundred twenty-seven thousand, nine hundred ninety-nine".