1399518 has 40 divisors (see below), whose sum is σ = 3214728. Its totient is φ = 454896.

The previous prime is 1399513. The next prime is 1399529. The reversal of 1399518 is 8159931.

It is a happy number.

1399518 is a `hidden beast` number, since 139 + 9 + 518 = 666.

It is a Curzon 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 (1399513) 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 19 ways as a sum of consecutive naturals, for example, 8505 + ... + 8667.

2^1399518 is an apocalyptic number.

1399518 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 1399518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607364).

1399518 is an abundant number, since it is smaller than the sum of its proper divisors (1815210).

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

1399518 is a wasteful number, since it uses less digits than its factorization.

1399518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 221 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1399518 is about 1183.0122569103. The cubic root of 1399518 is about 111.8560544471.

The spelling of 1399518 in words is "one million, three hundred ninety-nine thousand, five hundred eighteen".