378405389 has 2 divisors, whose sum is σ = 378405390. Its totient is φ = 378405388.

The previous prime is 378405343. The next prime is 378405403. The reversal of 378405389 is 983504873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336906025 + 41499364 = 18355^2 + 6442^2 .

It is a cyclic number.

It is not a de Polignac number, because 378405389 - 2¹⁶ = 378339853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378405089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189202694 + 189202695.

It is an arithmetic number, because the mean of its divisors is an integer number (189202695).

Almost surely, 2^378405389 is an apocalyptic number.

It is an amenable number.

378405389 is a deficient number, since it is larger than the sum of its proper divisors (1).

378405389 is an equidigital number, since it uses as much as digits as its factorization.

378405389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 378405389 is about 19452.6447816229. The cubic root of 378405389 is about 723.3010644617.

The spelling of 378405389 in words is "three hundred seventy-eight million, four hundred five thousand, three hundred eighty-nine".