1366398 has 48 divisors (see below), whose sum is σ = 3309696. Its totient is φ = 403920.

The previous prime is 1366397. The next prime is 1366427. The reversal of 1366398 is 8936631.

It is a happy number.

1366398 is a `hidden beast` number, since 13 + 6 + 639 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13215 + ... + 13317.

It is an arithmetic number, because the mean of its divisors is an integer number (68952).

2^1366398 is an apocalyptic number.

1366398 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 1366398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654848).

1366398 is an abundant number, since it is smaller than the sum of its proper divisors (1943298).

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

1366398 is a wasteful number, since it uses less digits than its factorization.

1366398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 186 counting only the distinct ones).

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

The square root of 1366398 is about 1168.9302802135. The cubic root of 1366398 is about 110.9666322883.

It can be divided in two parts, 1366 and 398, that added together give a square (1764 = 42²).

The spelling of 1366398 in words is "one million, three hundred sixty-six thousand, three hundred ninety-eight".