1398906 has 48 divisors (see below), whose sum is σ = 3294720. Its totient is φ = 427680.

The previous prime is 1398871. The next prime is 1398911. The reversal of 1398906 is 6098931.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12780 + ... + 12888.

It is an arithmetic number, because the mean of its divisors is an integer number (68640).

2^1398906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647360).

1398906 is an abundant number, since it is smaller than the sum of its proper divisors (1895814).

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

1398906 is a wasteful number, since it uses less digits than its factorization.

1398906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1398906 is about 1182.7535668938. The cubic root of 1398906 is about 111.8397474314.

It can be divided in two parts, 1398 and 906, that added together give a square (2304 = 48²).

The spelling of 1398906 in words is "one million, three hundred ninety-eight thousand, nine hundred six".