1399788 has 48 divisors (see below), whose sum is σ = 3912160. Its totient is φ = 430272.

The previous prime is 1399777. The next prime is 1399789. The reversal of 1399788 is 8879931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399789) 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 15 ways as a sum of consecutive naturals, for example, 906 + ... + 1902.

2^1399788 is an apocalyptic number.

1399788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956080).

1399788 is an abundant number, since it is smaller than the sum of its proper divisors (2512372).

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

1399788 is a wasteful number, since it uses less digits than its factorization.

1399788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 1015 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1399788 is about 1183.1263668772. The cubic root of 1399788 is about 111.8632472075.

It can be divided in two parts, 1399 and 788, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1399788 in words is "one million, three hundred ninety-nine thousand, seven hundred eighty-eight".