1399217 has 4 divisors (see below), whose sum is σ = 1472880. Its totient is φ = 1325556.

The previous prime is 1399213. The next prime is 1399231. The reversal of 1399217 is 7129931.

It is a happy number.

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 1399217 - 2² = 1399213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36803 + ... + 36840.

It is an arithmetic number, because the mean of its divisors is an integer number (368220).

2^1399217 is an apocalyptic number.

It is an amenable number.

1399217 is a deficient number, since it is larger than the sum of its proper divisors (73663).

1399217 is an equidigital number, since it uses as much as digits as its factorization.

1399217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73662.

The product of its digits is 3402, while the sum is 32.

The square root of 1399217 is about 1182.8850324524. The cubic root of 1399217 is about 111.8480347607.

It can be divided in two parts, 13 and 99217, that multiplied together give a palindrome (1289821).

The spelling of 1399217 in words is "one million, three hundred ninety-nine thousand, two hundred seventeen".