1386021 has 16 divisors (see below), whose sum is σ = 2274944. Its totient is φ = 730944.

The previous prime is 1386013. The next prime is 1386037. The reversal of 1386021 is 1206831.

It is not a de Polignac number, because 1386021 - 2³ = 1386013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2266 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (142184).

2^1386021 is an apocalyptic number.

It is an amenable number.

1386021 is a deficient number, since it is larger than the sum of its proper divisors (888923).

1386021 is a wasteful number, since it uses less digits than its factorization.

1386021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1386021 is about 1177.2939310130. The cubic root of 1386021 is about 111.4953110565.

The spelling of 1386021 in words is "one million, three hundred eighty-six thousand, twenty-one".