378890165 has 4 divisors (see below), whose sum is σ = 454668204. Its totient is φ = 303112128.

The previous prime is 378890147. The next prime is 378890167. The reversal of 378890165 is 561098873.

It is a happy number.

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 131079601 + 247810564 = 11449^2 + 15742^2 .

It is a cyclic number.

It is not a de Polignac number, because 378890165 - 2¹⁶ = 378824629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378890167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37889012 + ... + 37889021.

It is an arithmetic number, because the mean of its divisors is an integer number (113667051).

Almost surely, 2^378890165 is an apocalyptic number.

It is an amenable number.

378890165 is a deficient number, since it is larger than the sum of its proper divisors (75778039).

378890165 is an equidigital number, since it uses as much as digits as its factorization.

378890165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75778038.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 378890165 is about 19465.1012070320. The cubic root of 378890165 is about 723.6098068657.

The spelling of 378890165 in words is "three hundred seventy-eight million, eight hundred ninety thousand, one hundred sixty-five".