378693309 has 16 divisors (see below), whose sum is σ = 540639360. Its totient is φ = 234938880.

The previous prime is 378693283. The next prime is 378693311. The reversal of 378693309 is 903396873.

It is a happy number.

It is not a de Polignac number, because 378693309 - 2¹³ = 378685117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378693319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37177 + ... + 46254.

It is an arithmetic number, because the mean of its divisors is an integer number (33789960).

Almost surely, 2^378693309 is an apocalyptic number.

It is an amenable number.

378693309 is a deficient number, since it is larger than the sum of its proper divisors (161946051).

378693309 is a wasteful number, since it uses less digits than its factorization.

378693309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83540.

The product of its (nonzero) digits is 734832, while the sum is 48.

The square root of 378693309 is about 19460.0439105363. The cubic root of 378693309 is about 723.4844656962.

The spelling of 378693309 in words is "three hundred seventy-eight million, six hundred ninety-three thousand, three hundred nine".