378390161 has 4 divisors (see below), whose sum is σ = 385529652. Its totient is φ = 371250672.

The previous prime is 378390151. The next prime is 378390163. The reversal of 378390161 is 161093873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161093873 = 839 ⋅192007.

It can be written as a sum of positive squares in 2 ways, for example, as 339701761 + 38688400 = 18431^2 + 6220^2 .

It is a cyclic number.

It is not a de Polignac number, because 378390161 - 2¹⁸ = 378128017 is a prime.

It is a super-2 number, since 2×378390161² = 286358227883211842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378390163) 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, 3569666 + ... + 3569771.

It is an arithmetic number, because the mean of its divisors is an integer number (96382413).

Almost surely, 2^378390161 is an apocalyptic number.

It is an amenable number.

378390161 is a deficient number, since it is larger than the sum of its proper divisors (7139491).

378390161 is an equidigital number, since it uses as much as digits as its factorization.

378390161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139490.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 378390161 is about 19452.2533656129. The cubic root of 378390161 is about 723.2913618370.

The spelling of 378390161 in words is "three hundred seventy-eight million, three hundred ninety thousand, one hundred sixty-one".