1388521 has 8 divisors (see below), whose sum is σ = 1465344. Its totient is φ = 1313760.

The previous prime is 1388483. The next prime is 1388587. The reversal of 1388521 is 1258831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1388521 - 2⁷ = 1388393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388521.

It is not an unprimeable number, because it can be changed into a prime (1388021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 1933.

It is an arithmetic number, because the mean of its divisors is an integer number (183168).

2^1388521 is an apocalyptic number.

It is an amenable number.

1388521 is a deficient number, since it is larger than the sum of its proper divisors (76823).

1388521 is an equidigital number, since it uses as much as digits as its factorization.

1388521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its digits is 1920, while the sum is 28.

The square root of 1388521 is about 1178.3552096036. The cubic root of 1388521 is about 111.5623063993.

The spelling of 1388521 in words is "one million, three hundred eighty-eight thousand, five hundred twenty-one".