278661943 has 8 divisors (see below), whose sum is σ = 337204512. Its totient is φ = 224802816.

The previous prime is 278661941. The next prime is 278661947. The reversal of 278661943 is 349166872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 278661943 - 2¹ = 278661941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278661893 and 278661902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278661941) 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 7 ways as a sum of consecutive naturals, for example, 1170730 + ... + 1170967.

It is an arithmetic number, because the mean of its divisors is an integer number (42150564).

Almost surely, 2^278661943 is an apocalyptic number.

278661943 is a deficient number, since it is larger than the sum of its proper divisors (58542569).

278661943 is a wasteful number, since it uses less digits than its factorization.

278661943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341721.

The product of its digits is 435456, while the sum is 46.

The square root of 278661943 is about 16693.1705496589. The cubic root of 278661943 is about 653.1694849488.

The spelling of 278661943 in words is "two hundred seventy-eight million, six hundred sixty-one thousand, nine hundred forty-three".