378974815 has 4 divisors (see below), whose sum is σ = 454769784. Its totient is φ = 303179848.

The previous prime is 378974803. The next prime is 378974819. The reversal of 378974815 is 518479873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518479873 = 673 ⋅770401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378974815 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 (378974819) 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, 37897477 + ... + 37897486.

It is an arithmetic number, because the mean of its divisors is an integer number (113692446).

Almost surely, 2^378974815 is an apocalyptic number.

378974815 is a deficient number, since it is larger than the sum of its proper divisors (75794969).

378974815 is an equidigital number, since it uses as much as digits as its factorization.

378974815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75794968.

The product of its digits is 1693440, while the sum is 52.

The square root of 378974815 is about 19467.2754899087. The cubic root of 378974815 is about 723.6636914429.

The spelling of 378974815 in words is "three hundred seventy-eight million, nine hundred seventy-four thousand, eight hundred fifteen".