378638415 has 16 divisors (see below), whose sum is σ = 673135200. Its totient is φ = 201940416.

The previous prime is 378638387. The next prime is 378638417. The reversal of 378638415 is 514836873.

378638415 is a `hidden beast` number, since 3 + 7 + 8 + 638 + 4 + 1 + 5 = 666.

It is not a de Polignac number, because 378638415 - 2¹⁴ = 378622031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378638417) 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 15 ways as a sum of consecutive naturals, for example, 1402230 + ... + 1402499.

It is an arithmetic number, because the mean of its divisors is an integer number (42070950).

Almost surely, 2^378638415 is an apocalyptic number.

378638415 is a deficient number, since it is larger than the sum of its proper divisors (294496785).

378638415 is a wasteful number, since it uses less digits than its factorization.

378638415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804743 (or 2804737 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 378638415 is about 19458.6334309478. The cubic root of 378638415 is about 723.4495061177.

The spelling of 378638415 in words is "three hundred seventy-eight million, six hundred thirty-eight thousand, four hundred fifteen".