1398688 has 24 divisors (see below), whose sum is σ = 2785860. Its totient is φ = 691200.

The previous prime is 1398667. The next prime is 1398701. The reversal of 1398688 is 8868931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1140624 + 258064 = 1068^2 + 508^2 .

Its product of digits (82944) is a multiple of the sum of its prime divisors (512).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3288 + ... + 3688.

2^1398688 is an apocalyptic number.

It is an amenable number.

1398688 is a deficient number, since it is larger than the sum of its proper divisors (1387172).

1398688 is a wasteful number, since it uses less digits than its factorization.

1398688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 512 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 1398688 is about 1182.6614054750. The cubic root of 1398688 is about 111.8339375744.

It can be divided in two parts, 139868 and 8, that added together give a square (139876 = 374²).

The spelling of 1398688 in words is "one million, three hundred ninety-eight thousand, six hundred eighty-eight".