378638461 has 2 divisors, whose sum is σ = 378638462. Its totient is φ = 378638460.

The previous prime is 378638417. The next prime is 378638503. The reversal of 378638461 is 164836873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371294361 + 7344100 = 19269^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 378638461 - 2¹³ = 378630269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378638261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189319230 + 189319231.

It is an arithmetic number, because the mean of its divisors is an integer number (189319231).

Almost surely, 2^378638461 is an apocalyptic number.

It is an amenable number.

378638461 is a deficient number, since it is larger than the sum of its proper divisors (1).

378638461 is an equidigital number, since it uses as much as digits as its factorization.

378638461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 378638461 is about 19458.6346129424. The cubic root of 378638461 is about 723.4495354145.

The spelling of 378638461 in words is "three hundred seventy-eight million, six hundred thirty-eight thousand, four hundred sixty-one".