387434221 has 2 divisors, whose sum is σ = 387434222. Its totient is φ = 387434220.

The previous prime is 387434209. The next prime is 387434227. The reversal of 387434221 is 122434783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355737321 + 31696900 = 18861^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 387434221 - 2⁵ = 387434189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387434227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193717110 + 193717111.

It is an arithmetic number, because the mean of its divisors is an integer number (193717111).

Almost surely, 2^387434221 is an apocalyptic number.

It is an amenable number.

387434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

387434221 is an equidigital number, since it uses as much as digits as its factorization.

387434221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 34.

The square root of 387434221 is about 19683.3488258477. The cubic root of 387434221 is about 729.0086129585.

The spelling of 387434221 in words is "three hundred eighty-seven million, four hundred thirty-four thousand, two hundred twenty-one".