1386420521 has 2 divisors, whose sum is σ = 1386420522. Its totient is φ = 1386420520.

The previous prime is 1386420517. The next prime is 1386420559. The reversal of 1386420521 is 1250246831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1322340496 + 64080025 = 36364^2 + 8005^2 .

It is an emirp because it is prime and its reverse (1250246831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1386420521 - 2² = 1386420517 is a prime.

It is a super-2 number, since 2×1386420521² = 3844323722099822882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1386420571) 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 as a sum of consecutive naturals, namely, 693210260 + 693210261.

It is an arithmetic number, because the mean of its divisors is an integer number (693210261).

Almost surely, 2^1386420521 is an apocalyptic number.

It is an amenable number.

1386420521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386420521 is an equidigital number, since it uses as much as digits as its factorization.

1386420521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1386420521 is about 37234.6682676239. The cubic root of 1386420521 is about 1115.0602288043.

The spelling of 1386420521 in words is "one billion, three hundred eighty-six million, four hundred twenty thousand, five hundred twenty-one".