378638487 has 6 divisors (see below), whose sum is σ = 546922272. Its totient is φ = 252425652.

The previous prime is 378638461. The next prime is 378638503. The reversal of 378638487 is 784836873.

It is not a de Polignac number, because 378638487 - 2¹⁶ = 378572951 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 21035463 + ... + 21035480.

It is an arithmetic number, because the mean of its divisors is an integer number (91153712).

Almost surely, 2^378638487 is an apocalyptic number.

378638487 is a deficient number, since it is larger than the sum of its proper divisors (168283785).

378638487 is a wasteful number, since it uses less digits than its factorization.

378638487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42070949 (or 42070946 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The square root of 378638487 is about 19458.6352810263. The cubic root of 378638487 is about 723.4495519736.

The spelling of 378638487 in words is "three hundred seventy-eight million, six hundred thirty-eight thousand, four hundred eighty-seven".