387836021 has 2 divisors, whose sum is σ = 387836022. Its totient is φ = 387836020.

The previous prime is 387835979. The next prime is 387836023. The reversal of 387836021 is 120638783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315772900 + 72063121 = 17770^2 + 8489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387836021 is a prime.

It is a super-2 number, since 2×387836021² = 300833558370224882, which contains 22 as substring.

Together with 387836023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387836023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193918010 + 193918011.

It is an arithmetic number, because the mean of its divisors is an integer number (193918011).

Almost surely, 2^387836021 is an apocalyptic number.

It is an amenable number.

387836021 is a deficient number, since it is larger than the sum of its proper divisors (1).

387836021 is an equidigital number, since it uses as much as digits as its factorization.

387836021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 387836021 is about 19693.5527774955. The cubic root of 387836021 is about 729.2605391300.

The spelling of 387836021 in words is "three hundred eighty-seven million, eight hundred thirty-six thousand, twenty-one".