378966641 has 2 divisors, whose sum is σ = 378966642. Its totient is φ = 378966640.

The previous prime is 378966619. The next prime is 378966659. The reversal of 378966641 is 146669873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355888225 + 23078416 = 18865^2 + 4804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378966641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 378966641.

It is not a weakly prime, because it can be changed into another prime (378966541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189483320 + 189483321.

It is an arithmetic number, because the mean of its divisors is an integer number (189483321).

Almost surely, 2^378966641 is an apocalyptic number.

It is an amenable number.

378966641 is a deficient number, since it is larger than the sum of its proper divisors (1).

378966641 is an equidigital number, since it uses as much as digits as its factorization.

378966641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 378966641 is about 19467.0655467125. The cubic root of 378966641 is about 723.6584885734.

The spelling of 378966641 in words is "three hundred seventy-eight million, nine hundred sixty-six thousand, six hundred forty-one".