378632891 has 16 divisors (see below), whose sum is σ = 493424064. Its totient is φ = 281954304.

The previous prime is 378632873. The next prime is 378632897. The reversal of 378632891 is 198236873.

It is a cyclic number.

It is not a de Polignac number, because 378632891 - 2¹⁴ = 378616507 is a prime.

It is a super-2 number, since 2×378632891² = 286725732294035762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (378632897) 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 15 ways as a sum of consecutive naturals, for example, 120830 + ... + 123923.

It is an arithmetic number, because the mean of its divisors is an integer number (30839004).

Almost surely, 2^378632891 is an apocalyptic number.

378632891 is a deficient number, since it is larger than the sum of its proper divisors (114791173).

378632891 is a wasteful number, since it uses less digits than its factorization.

378632891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244790.

The product of its digits is 435456, while the sum is 47.

The square root of 378632891 is about 19458.4914882937. The cubic root of 378632891 is about 723.4459879376.

The spelling of 378632891 in words is "three hundred seventy-eight million, six hundred thirty-two thousand, eight hundred ninety-one".