387651421 has 2 divisors, whose sum is σ = 387651422. Its totient is φ = 387651420.

The previous prime is 387651379. The next prime is 387651449. The reversal of 387651421 is 124156783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343694521 + 43956900 = 18539^2 + 6630^2 .

It is a cyclic number.

It is not a de Polignac number, because 387651421 - 2⁹ = 387650909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387651461) 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, 193825710 + 193825711.

It is an arithmetic number, because the mean of its divisors is an integer number (193825711).

Almost surely, 2^387651421 is an apocalyptic number.

It is an amenable number.

387651421 is a deficient number, since it is larger than the sum of its proper divisors (1).

387651421 is an equidigital number, since it uses as much as digits as its factorization.

387651421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 387651421 is about 19688.8654066201. The cubic root of 387651421 is about 729.1448176630.

It can be divided in two parts, 38765 and 1421, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 387651421 in words is "three hundred eighty-seven million, six hundred fifty-one thousand, four hundred twenty-one".