1398605 has 8 divisors (see below), whose sum is σ = 1807512. Its totient is φ = 1032768.

The previous prime is 1398599. The next prime is 1398611. The reversal of 1398605 is 5068931.

It is an interprime number because it is at equal distance from previous prime (1398599) and next prime (1398611).

It can be written as a sum of positive squares in 4 ways, for example, as 3844 + 1394761 = 62^2 + 1181^2 .

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 1398605 - 2⁶ = 1398541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10694 + ... + 10823.

It is an arithmetic number, because the mean of its divisors is an integer number (225939).

2^1398605 is an apocalyptic number.

It is an amenable number.

1398605 is a deficient number, since it is larger than the sum of its proper divisors (408907).

1398605 is a wasteful number, since it uses less digits than its factorization.

1398605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21535.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1398605 is about 1182.6263146066. The cubic root of 1398605 is about 111.8317254059.

The spelling of 1398605 in words is "one million, three hundred ninety-eight thousand, six hundred five".