378564869 has 4 divisors (see below), whose sum is σ = 391618860. Its totient is φ = 365510880.

The previous prime is 378564821. The next prime is 378564877. The reversal of 378564869 is 968465873.

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 287133025 + 91431844 = 16945^2 + 9562^2 .

It is a cyclic number.

It is not a de Polignac number, because 378564869 - 2¹² = 378560773 is a prime.

It is a super-2 number, since 2×378564869² = 286622720081974322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378564899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6526952 + ... + 6527009.

It is an arithmetic number, because the mean of its divisors is an integer number (97904715).

Almost surely, 2^378564869 is an apocalyptic number.

It is an amenable number.

378564869 is a deficient number, since it is larger than the sum of its proper divisors (13053991).

378564869 is a wasteful number, since it uses less digits than its factorization.

378564869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13053990.

The product of its digits is 8709120, while the sum is 56.

The square root of 378564869 is about 19456.7435353401. The cubic root of 378564869 is about 723.4026626029.

The spelling of 378564869 in words is "three hundred seventy-eight million, five hundred sixty-four thousand, eight hundred sixty-nine".