1388987 has 4 divisors (see below), whose sum is σ = 1401840. Its totient is φ = 1376136.

The previous prime is 1388969. The next prime is 1389001. The reversal of 1388987 is 7898831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1388987 - 2¹⁸ = 1126843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388927) 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, 6263 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (350460).

2^1388987 is an apocalyptic number.

1388987 is a deficient number, since it is larger than the sum of its proper divisors (12853).

1388987 is a wasteful number, since it uses less digits than its factorization.

1388987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852.

The product of its digits is 96768, while the sum is 44.

The square root of 1388987 is about 1178.5529262617. The cubic root of 1388987 is about 111.5747854376.

The spelling of 1388987 in words is "one million, three hundred eighty-eight thousand, nine hundred eighty-seven".