1393988 has 12 divisors (see below), whose sum is σ = 2447760. Its totient is φ = 694632.

The previous prime is 1393981. The next prime is 1393991. The reversal of 1393988 is 8893931.

1393988 is nontrivially palindromic in base 5.

It is not an unprimeable number, because it can be changed into a prime (1393981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943 + ... + 2561.

It is an arithmetic number, because the mean of its divisors is an integer number (203980).

2^1393988 is an apocalyptic number.

It is an amenable number.

1393988 is a deficient number, since it is larger than the sum of its proper divisors (1053772).

1393988 is a wasteful number, since it uses less digits than its factorization.

1393988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186 (or 1184 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 1393988 is about 1180.6726896138. The cubic root of 1393988 is about 111.7085321103.

The spelling of 1393988 in words is "one million, three hundred ninety-three thousand, nine hundred eighty-eight".