378391073 has 4 divisors (see below), whose sum is σ = 378463620. Its totient is φ = 378318528.

The previous prime is 378391019. The next prime is 378391087. The reversal of 378391073 is 370193873.

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 91833889 + 286557184 = 9583^2 + 16928^2 .

It is a cyclic number.

It is not a de Polignac number, because 378391073 - 2¹⁰ = 378390049 is a prime.

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 378391073.

It is not an unprimeable number, because it can be changed into a prime (378391373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27788 + ... + 39101.

It is an arithmetic number, because the mean of its divisors is an integer number (94615905).

Almost surely, 2^378391073 is an apocalyptic number.

It is an amenable number.

378391073 is a deficient number, since it is larger than the sum of its proper divisors (72547).

378391073 is an equidigital number, since it uses as much as digits as its factorization.

378391073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72546.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 378391073 is about 19452.2768076130. The cubic root of 378391073 is about 723.2919429314.

The spelling of 378391073 in words is "three hundred seventy-eight million, three hundred ninety-one thousand, seventy-three".