387434209 has 2 divisors, whose sum is σ = 387434210. Its totient is φ = 387434208.

The previous prime is 387434197. The next prime is 387434221. The reversal of 387434209 is 902434783.

It is a balanced prime because it is at equal distance from previous prime (387434197) and next prime (387434221).

It can be written as a sum of positive squares in only one way, i.e., 366531025 + 20903184 = 19145^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 387434209 - 2²⁵ = 353879777 is a prime.

It is not a weakly prime, because it can be changed into another prime (387434269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193717104 + 193717105.

It is an arithmetic number, because the mean of its divisors is an integer number (193717105).

Almost surely, 2^387434209 is an apocalyptic number.

It is an amenable number.

387434209 is a deficient number, since it is larger than the sum of its proper divisors (1).

387434209 is an equidigital number, since it uses as much as digits as its factorization.

387434209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 387434209 is about 19683.3485210215. The cubic root of 387434209 is about 729.0086054319.

It can be divided in two parts, 3874 and 34209, that added together give a palindrome (38083).

The spelling of 387434209 in words is "three hundred eighty-seven million, four hundred thirty-four thousand, two hundred nine".