378642989 has 4 divisors (see below), whose sum is σ = 400916124. Its totient is φ = 356369856.

The previous prime is 378642977. The next prime is 378643003. The reversal of 378642989 is 989246873.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989246873 = 191 ⋅5179303.

It can be written as a sum of positive squares in 2 ways, for example, as 162052900 + 216590089 = 12730^2 + 14717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378642989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378642949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11136542 + ... + 11136575.

It is an arithmetic number, because the mean of its divisors is an integer number (100229031).

Almost surely, 2^378642989 is an apocalyptic number.

It is an amenable number.

378642989 is a deficient number, since it is larger than the sum of its proper divisors (22273135).

378642989 is a wasteful number, since it uses less digits than its factorization.

378642989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22273134.

The product of its digits is 5225472, while the sum is 56.

The square root of 378642989 is about 19458.7509619708. The cubic root of 378642989 is about 723.4524192266.

The spelling of 378642989 in words is "three hundred seventy-eight million, six hundred forty-two thousand, nine hundred eighty-nine".