1399205 has 10 divisors (see below), whose sum is σ = 1755366. Its totient is φ = 1070696.

The previous prime is 1399201. The next prime is 1399213. The reversal of 1399205 is 5029931.

It can be written as a sum of positive squares in only one way, i.e., 1119364 + 279841 = 1058^2 + 529^2 .

It is not a de Polignac number, because 1399205 - 2² = 1399201 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399201) 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 9 ways as a sum of consecutive naturals, for example, 60824 + ... + 60846.

2^1399205 is an apocalyptic number.

It is an amenable number.

1399205 is a deficient number, since it is larger than the sum of its proper divisors (356161).

1399205 is an frugal number, since it uses more digits than its factorization.

1399205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 1399205 is about 1182.8799600974. The cubic root of 1399205 is about 111.8477150152.

The spelling of 1399205 in words is "one million, three hundred ninety-nine thousand, two hundred five".