378825009 has 4 divisors (see below), whose sum is σ = 505100016. Its totient is φ = 252550004.

The previous prime is 378825001. The next prime is 378825011. The reversal of 378825009 is 900528873.

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 a cyclic number.

It is not a de Polignac number, because 378825009 - 2³ = 378825001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378825001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63137499 + ... + 63137504.

It is an arithmetic number, because the mean of its divisors is an integer number (126275004).

Almost surely, 2^378825009 is an apocalyptic number.

It is an amenable number.

378825009 is a deficient number, since it is larger than the sum of its proper divisors (126275007).

378825009 is a wasteful number, since it uses less digits than its factorization.

378825009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126275006.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 378825009 is about 19463.4274730840. The cubic root of 378825009 is about 723.5683258705.

The spelling of 378825009 in words is "three hundred seventy-eight million, eight hundred twenty-five thousand, nine".