378739831 has 2 divisors, whose sum is σ = 378739832. Its totient is φ = 378739830.

The previous prime is 378739819. The next prime is 378739847. The reversal of 378739831 is 138937873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 378739831 - 2¹¹ = 378737783 is a prime.

It is a super-2 number, since 2×378739831² = 286887719171817122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378739531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189369915 + 189369916.

It is an arithmetic number, because the mean of its divisors is an integer number (189369916).

Almost surely, 2^378739831 is an apocalyptic number.

378739831 is a deficient number, since it is larger than the sum of its proper divisors (1).

378739831 is an equidigital number, since it uses as much as digits as its factorization.

378739831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 378739831 is about 19461.2391948714. The cubic root of 378739831 is about 723.5140908708.

The spelling of 378739831 in words is "three hundred seventy-eight million, seven hundred thirty-nine thousand, eight hundred thirty-one".