387420921 has 8 divisors (see below), whose sum is σ = 573956960. Its totient is φ = 258280596.

The previous prime is 387420883. The next prime is 387420923. The reversal of 387420921 is 129024783.

It is not a de Polignac number, because 387420921 - 2¹⁰ = 387419897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387420923) 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 in 7 ways as a sum of consecutive naturals, for example, 7174435 + ... + 7174488.

It is an arithmetic number, because the mean of its divisors is an integer number (71744620).

Almost surely, 2^387420921 is an apocalyptic number.

It is an amenable number.

387420921 is a deficient number, since it is larger than the sum of its proper divisors (186536039).

387420921 is a wasteful number, since it uses less digits than its factorization.

387420921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14348932 (or 14348926 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 387420921 is about 19683.0109739338. The cubic root of 387420921 is about 729.0002709613. Note that the first 3 decimals are identical.

The spelling of 387420921 in words is "three hundred eighty-seven million, four hundred twenty thousand, nine hundred twenty-one".