1398618 has 48 divisors (see below), whose sum is σ = 3363360. Its totient is φ = 417312.

The previous prime is 1398611. The next prime is 1398619. The reversal of 1398618 is 8168931.

1398618 is a `hidden beast` number, since 1 + 39 + 8 + 618 = 666.

It is a super-2 number, since 2×1398618² = 3912264619848, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1398611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9993 + ... + 10131.

It is an arithmetic number, because the mean of its divisors is an integer number (70070).

2^1398618 is an apocalyptic number.

1398618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681680).

1398618 is an abundant number, since it is smaller than the sum of its proper divisors (1964742).

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

1398618 is a wasteful number, since it uses less digits than its factorization.

1398618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 200 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1398618 is about 1182.6318108355. The cubic root of 1398618 is about 111.8320718959.

It can be divided in two parts, 1398 and 618, that added together give a triangular number (2016 = T₆₃).

The spelling of 1398618 in words is "one million, three hundred ninety-eight thousand, six hundred eighteen".