1386982021 has 4 divisors (see below), whose sum is σ = 1387075212. Its totient is φ = 1386888832.

The previous prime is 1386981997. The next prime is 1386982039. The reversal of 1386982021 is 1202896831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1094948100 + 292033921 = 33090^2 + 17089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386982021 - 2²³ = 1378593413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386982081) 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, 18706 + ... + 55891.

It is an arithmetic number, because the mean of its divisors is an integer number (346768803).

Almost surely, 2^1386982021 is an apocalyptic number.

It is an amenable number.

1386982021 is a deficient number, since it is larger than the sum of its proper divisors (93191).

1386982021 is an equidigital number, since it uses as much as digits as its factorization.

1386982021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93190.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1386982021 is about 37242.2075205002. The cubic root of 1386982021 is about 1115.2107415345.

The spelling of 1386982021 in words is "one billion, three hundred eighty-six million, nine hundred eighty-two thousand, twenty-one".