387637421 has 2 divisors, whose sum is σ = 387637422. Its totient is φ = 387637420.

The previous prime is 387637409. The next prime is 387637429. The reversal of 387637421 is 124736783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308178025 + 79459396 = 17555^2 + 8914^2 .

It is a cyclic number.

It is not a de Polignac number, because 387637421 - 2¹⁴ = 387621037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387637429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193818710 + 193818711.

It is an arithmetic number, because the mean of its divisors is an integer number (193818711).

Almost surely, 2^387637421 is an apocalyptic number.

It is an amenable number.

387637421 is a deficient number, since it is larger than the sum of its proper divisors (1).

387637421 is an equidigital number, since it uses as much as digits as its factorization.

387637421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 41.

The square root of 387637421 is about 19688.5098725119. The cubic root of 387637421 is about 729.1360398884.

The spelling of 387637421 in words is "three hundred eighty-seven million, six hundred thirty-seven thousand, four hundred twenty-one".