1398309 has 8 divisors (see below), whose sum is σ = 2033952. Its totient is φ = 847440.

The previous prime is 1398307. The next prime is 1398323. The reversal of 1398309 is 9038931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1398309 - 2¹ = 1398307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 42373 = 1398309 / (1 + 3 + 9 + 8 + 3 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 1398309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21154 + ... + 21219.

It is an arithmetic number, because the mean of its divisors is an integer number (254244).

2^1398309 is an apocalyptic number.

It is an amenable number.

1398309 is a deficient number, since it is larger than the sum of its proper divisors (635643).

1398309 is a wasteful number, since it uses less digits than its factorization.

1398309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42387.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 1398309 is about 1182.5011627901. The cubic root of 1398309 is about 111.8238355141.

It can be divided in two parts, 139 and 8309, that added together give a palindrome (8448).

The spelling of 1398309 in words is "one million, three hundred ninety-eight thousand, three hundred nine".