1399988 has 12 divisors (see below), whose sum is σ = 2473632. Its totient is φ = 693240.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399988 is 8899931.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1208 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (206136).

2^1399988 is an apocalyptic number.

It is an amenable number.

1399988 is a deficient number, since it is larger than the sum of its proper divisors (1073644).

1399988 is a wasteful number, since it uses less digits than its factorization.

1399988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382 (or 3380 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 1399988 is about 1183.2108856835. The cubic root of 1399988 is about 111.8685745818.

It can be divided in two parts, 13 and 99988, that added together give a palindrome (100001).

The spelling of 1399988 in words is "one million, three hundred ninety-nine thousand, nine hundred eighty-eight".