1398109 has 8 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 1352400.

The previous prime is 1398107. The next prime is 1398113. The reversal of 1398109 is 9018931.

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

It is a cyclic number.

It is not a de Polignac number, because 1398109 - 2¹ = 1398107 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398107) 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, 6999 + ... + 7195.

It is an arithmetic number, because the mean of its divisors is an integer number (180576).

2^1398109 is an apocalyptic number.

It is an amenable number.

1398109 is a deficient number, since it is larger than the sum of its proper divisors (46499).

1398109 is a wasteful number, since it uses less digits than its factorization.

1398109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1398109 is about 1182.4165932530. The cubic root of 1398109 is about 111.8185038758.

The spelling of 1398109 in words is "one million, three hundred ninety-eight thousand, one hundred nine".