378147817 has 4 divisors (see below), whose sum is σ = 378199120. Its totient is φ = 378096516.

The previous prime is 378147793. The next prime is 378147821. The reversal of 378147817 is 718741873.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 718741873 = 461 ⋅1559093.

It is a cyclic number.

It is not a de Polignac number, because 378147817 - 2¹¹ = 378145769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378147877) 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, 12267 + ... + 30112.

It is an arithmetic number, because the mean of its divisors is an integer number (94549780).

Almost surely, 2^378147817 is an apocalyptic number.

It is an amenable number.

378147817 is a deficient number, since it is larger than the sum of its proper divisors (51303).

378147817 is an equidigital number, since it uses as much as digits as its factorization.

378147817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51302.

The product of its digits is 263424, while the sum is 46.

The square root of 378147817 is about 19446.0231667043. The cubic root of 378147817 is about 723.1369156469.

The spelling of 378147817 in words is "three hundred seventy-eight million, one hundred forty-seven thousand, eight hundred seventeen".