387441409 has 2 divisors, whose sum is σ = 387441410. Its totient is φ = 387441408.

The previous prime is 387441403. The next prime is 387441419. The reversal of 387441409 is 904144783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301786384 + 85655025 = 17372^2 + 9255^2 .

It is a cyclic number.

It is not a de Polignac number, because 387441409 - 2⁷ = 387441281 is a prime.

It is a super-2 number, since 2×387441409² = 300221690815810562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (387441403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193720704 + 193720705.

It is an arithmetic number, because the mean of its divisors is an integer number (193720705).

Almost surely, 2^387441409 is an apocalyptic number.

It is an amenable number.

387441409 is a deficient number, since it is larger than the sum of its proper divisors (1).

387441409 is an equidigital number, since it uses as much as digits as its factorization.

387441409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 387441409 is about 19683.5314158817. The cubic root of 387441409 is about 729.0131213208.

It can be divided in two parts, 38 and 7441409, that added together give a palindrome (7441447).

The spelling of 387441409 in words is "three hundred eighty-seven million, four hundred forty-one thousand, four hundred nine".