1388387 has 32 divisors (see below), whose sum is σ = 1989120. Its totient is φ = 933120.

The previous prime is 1388381. The next prime is 1388393. The reversal of 1388387 is 7838831.

1388387 is nontrivially palindromic in base 9.

It is an interprime number because it is at equal distance from previous prime (1388381) and next prime (1388393).

It is a cyclic number.

It is not a de Polignac number, because 1388387 - 2⁶ = 1388323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1388387.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18983 + ... + 19055.

It is an arithmetic number, because the mean of its divisors is an integer number (62160).

2^1388387 is an apocalyptic number.

1388387 is a deficient number, since it is larger than the sum of its proper divisors (600733).

1388387 is a wasteful number, since it uses less digits than its factorization.

1388387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123.

The product of its digits is 32256, while the sum is 38.

The square root of 1388387 is about 1178.2983493157. The cubic root of 1388387 is about 111.5587174895.

The spelling of 1388387 in words is "one million, three hundred eighty-eight thousand, three hundred eighty-seven".