387420421 has 4 divisors (see below), whose sum is σ = 387516844. Its totient is φ = 387324000.

The previous prime is 387420391. The next prime is 387420433. The reversal of 387420421 is 124024783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67404100 + 320016321 = 8210^2 + 17889^2 .

It is a cyclic number.

It is not a de Polignac number, because 387420421 - 2⁹ = 387419909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387420721) 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 3 ways as a sum of consecutive naturals, for example, 41910 + ... + 50311.

It is an arithmetic number, because the mean of its divisors is an integer number (96879211).

Almost surely, 2^387420421 is an apocalyptic number.

It is an amenable number.

387420421 is a deficient number, since it is larger than the sum of its proper divisors (96423).

387420421 is an equidigital number, since it uses as much as digits as its factorization.

387420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96422.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 387420421 is about 19682.9982726210. The cubic root of 387420421 is about 728.9999573487. Note that the first 4 decimals are identical.

The spelling of 387420421 in words is "three hundred eighty-seven million, four hundred twenty thousand, four hundred twenty-one".