378168321 has 4 divisors (see below), whose sum is σ = 504224432. Its totient is φ = 252112212.

The previous prime is 378168319. The next prime is 378168331. The reversal of 378168321 is 123861873.

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.

It is not a de Polignac number, because 378168321 - 2¹ = 378168319 is a prime.

It is a super-2 number, since 2×378168321² = 286022558015918082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378168321.

It is not an unprimeable number, because it can be changed into a prime (378168331) 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, 63028051 + ... + 63028056.

It is an arithmetic number, because the mean of its divisors is an integer number (126056108).

Almost surely, 2^378168321 is an apocalyptic number.

It is an amenable number.

378168321 is a deficient number, since it is larger than the sum of its proper divisors (126056111).

378168321 is a wasteful number, since it uses less digits than its factorization.

378168321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126056110.

The product of its digits is 48384, while the sum is 39.

The square root of 378168321 is about 19446.5503624679. The cubic root of 378168321 is about 723.1499854313.

The spelling of 378168321 in words is "three hundred seventy-eight million, one hundred sixty-eight thousand, three hundred twenty-one".