1399356 has 60 divisors (see below), whose sum is σ = 4187568. Its totient is φ = 399168.

The previous prime is 1399351. The next prime is 1399357. The reversal of 1399356 is 6539931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399351) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1960 + ... + 2576.

2^1399356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2093784).

1399356 is an abundant number, since it is smaller than the sum of its proper divisors (2788212).

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

1399356 is a wasteful number, since it uses less digits than its factorization.

1399356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 629 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 1399356 is about 1182.9437856466. The cubic root of 1399356 is about 111.8517383469.

The spelling of 1399356 in words is "one million, three hundred ninety-nine thousand, three hundred fifty-six".