387038021 has 4 divisors (see below), whose sum is σ = 387086700. Its totient is φ = 386989344.

The previous prime is 387038009. The next prime is 387038027. The reversal of 387038021 is 120830783.

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 255040900 + 131997121 = 15970^2 + 11489^2 .

It is a cyclic number.

It is not a de Polignac number, because 387038021 - 2⁶ = 387037957 is a prime.

It is a super-3 number, since 3×387038021³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387038027) 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, 9326 + ... + 29343.

It is an arithmetic number, because the mean of its divisors is an integer number (96771675).

Almost surely, 2^387038021 is an apocalyptic number.

It is an amenable number.

387038021 is a deficient number, since it is larger than the sum of its proper divisors (48679).

387038021 is a wasteful number, since it uses less digits than its factorization.

387038021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48678.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 387038021 is about 19673.2819071959. The cubic root of 387038021 is about 728.7600273416.

The spelling of 387038021 in words is "three hundred eighty-seven million, thirty-eight thousand, twenty-one".