1398636 has 18 divisors (see below), whose sum is σ = 3535532. Its totient is φ = 466200.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398636 is 6368931.

It is a happy number.

1398636 is a `hidden beast` number, since 13 + 9 + 8 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38851 = 1398636 / (1 + 3 + 9 + 8 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1398636.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19390 + ... + 19461.

2^1398636 is an apocalyptic number.

It is an amenable number.

1398636 is an abundant number, since it is smaller than the sum of its proper divisors (2136896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398636 is a wasteful number, since it uses less digits than its factorization.

1398636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38861 (or 38856 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1398636 is about 1182.6394209564. The cubic root of 1398636 is about 111.8325516477.

The spelling of 1398636 in words is "one million, three hundred ninety-eight thousand, six hundred thirty-six".