385377509 has 4 divisors (see below), whose sum is σ = 420411840. Its totient is φ = 350343180.

The previous prime is 385377497. The next prime is 385377521. The reversal of 385377509 is 905773583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (385377497) and next prime (385377521).

It is not a de Polignac number, because 385377509 - 2⁴ = 385377493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385377599) 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, 17517149 + ... + 17517170.

It is an arithmetic number, because the mean of its divisors is an integer number (105102960).

Almost surely, 2^385377509 is an apocalyptic number.

It is an amenable number.

385377509 is a deficient number, since it is larger than the sum of its proper divisors (35034331).

385377509 is a wasteful number, since it uses less digits than its factorization.

385377509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35034330.

The product of its (nonzero) digits is 793800, while the sum is 47.

The square root of 385377509 is about 19631.0343334222. The cubic root of 385377509 is about 727.7163318651.

The spelling of 385377509 in words is "three hundred eighty-five million, three hundred seventy-seven thousand, five hundred nine".