1388678 has 4 divisors (see below), whose sum is σ = 2083020. Its totient is φ = 694338.

The previous prime is 1388669. The next prime is 1388687. The reversal of 1388678 is 8768831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8768831 = 929 ⋅9439.

It is an interprime number because it is at equal distance from previous prime (1388669) and next prime (1388687).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347168 + ... + 347171.

It is an arithmetic number, because the mean of its divisors is an integer number (520755).

2^1388678 is an apocalyptic number.

1388678 is a deficient number, since it is larger than the sum of its proper divisors (694342).

1388678 is an equidigital number, since it uses as much as digits as its factorization.

1388678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694341.

The product of its digits is 64512, while the sum is 41.

The square root of 1388678 is about 1178.4218260029. The cubic root of 1388678 is about 111.5665110223.

The spelling of 1388678 in words is "one million, three hundred eighty-eight thousand, six hundred seventy-eight".