387426321 has 56 divisors (see below), whose sum is σ = 620649120. Its totient is φ = 241024896.

The previous prime is 387426301. The next prime is 387426323. The reversal of 387426321 is 123624783.

It is a happy number.

It is not a de Polignac number, because 387426321 - 2⁵ = 387426289 is a prime.

It is a Leyland number of the form 18³ + 3¹⁸.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (387426323) 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 in 55 ways as a sum of consecutive naturals, for example, 1149465 + ... + 1149801.

It is an arithmetic number, because the mean of its divisors is an integer number (11083020).

Almost surely, 2^387426321 is an apocalyptic number.

It is an amenable number.

387426321 is a deficient number, since it is larger than the sum of its proper divisors (233222799).

387426321 is an equidigital number, since it uses as much as digits as its factorization.

387426321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 442 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 387426321 is about 19683.1481475906. The cubic root of 387426321 is about 729.0036579606.

The spelling of 387426321 in words is "three hundred eighty-seven million, four hundred twenty-six thousand, three hundred twenty-one".