385648409 has 4 divisors (see below), whose sum is σ = 398946660. Its totient is φ = 372350160.

The previous prime is 385648399. The next prime is 385648421. The reversal of 385648409 is 904846583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 242487184 + 143161225 = 15572^2 + 11965^2 .

It is a cyclic number.

It is not a de Polignac number, because 385648409 - 2¹² = 385644313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385648469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6649082 + ... + 6649139.

It is an arithmetic number, because the mean of its divisors is an integer number (99736665).

Almost surely, 2^385648409 is an apocalyptic number.

It is an amenable number.

385648409 is a deficient number, since it is larger than the sum of its proper divisors (13298251).

385648409 is a wasteful number, since it uses less digits than its factorization.

385648409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298250.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 385648409 is about 19637.9329105688. The cubic root of 385648409 is about 727.8868072865.

The spelling of 385648409 in words is "three hundred eighty-five million, six hundred forty-eight thousand, four hundred nine".