378726989 has 2 divisors, whose sum is σ = 378726990. Its totient is φ = 378726988.

The previous prime is 378726949. The next prime is 378727009. The reversal of 378726989 is 989627873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229764964 + 148962025 = 15158^2 + 12205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378726989 is a prime.

It is a super-2 number, since 2×378726989² = 286868264394012242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378726919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189363494 + 189363495.

It is an arithmetic number, because the mean of its divisors is an integer number (189363495).

Almost surely, 2^378726989 is an apocalyptic number.

It is an amenable number.

378726989 is a deficient number, since it is larger than the sum of its proper divisors (1).

378726989 is an equidigital number, since it uses as much as digits as its factorization.

378726989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 378726989 is about 19460.9092541947. The cubic root of 378726989 is about 723.5059133373.

The spelling of 378726989 in words is "three hundred seventy-eight million, seven hundred twenty-six thousand, nine hundred eighty-nine".