378777449 has 4 divisors (see below), whose sum is σ = 379012740. Its totient is φ = 378542160.

The previous prime is 378777431. The next prime is 378777467. The reversal of 378777449 is 944777873.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (378777431) and next prime (378777467).

It can be written as a sum of positive squares in 2 ways, for example, as 295840000 + 82937449 = 17200^2 + 9107^2 .

It is a cyclic number.

It is not a de Polignac number, because 378777449 - 2⁸ = 378777193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 378777394 and 378777403.

It is not an unprimeable number, because it can be changed into a prime (378777349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115214 + ... + 118455.

It is an arithmetic number, because the mean of its divisors is an integer number (94753185).

Almost surely, 2^378777449 is an apocalyptic number.

It is an amenable number.

378777449 is a deficient number, since it is larger than the sum of its proper divisors (235291).

378777449 is a wasteful number, since it uses less digits than its factorization.

378777449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235290.

The product of its digits is 8297856, while the sum is 56.

The square root of 378777449 is about 19462.2056560915. The cubic root of 378777449 is about 723.5380442109.

The spelling of 378777449 in words is "three hundred seventy-eight million, seven hundred seventy-seven thousand, four hundred forty-nine".