378189431 has 2 divisors, whose sum is σ = 378189432. Its totient is φ = 378189430.

The previous prime is 378189407. The next prime is 378189439. The reversal of 378189431 is 134981873.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378189431 is a prime.

It is a super-2 number, since 2×378189431² = 286054491440207522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378189439) 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 as a sum of consecutive naturals, namely, 189094715 + 189094716.

It is an arithmetic number, because the mean of its divisors is an integer number (189094716).

Almost surely, 2^378189431 is an apocalyptic number.

378189431 is a deficient number, since it is larger than the sum of its proper divisors (1).

378189431 is an equidigital number, since it uses as much as digits as its factorization.

378189431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 378189431 is about 19447.0931246806. The cubic root of 378189431 is about 723.1634410024.

The spelling of 378189431 in words is "three hundred seventy-eight million, one hundred eighty-nine thousand, four hundred thirty-one".