278973940 has 48 divisors (see below), whose sum is σ = 676472832. Its totient is φ = 94657536.

The previous prime is 278973917. The next prime is 278973943. The reversal of 278973940 is 49379872.

278973940 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278973943) 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 15 ways as a sum of consecutive naturals, for example, 3309 + ... + 23851.

It is an arithmetic number, because the mean of its divisors is an integer number (14093184).

Almost surely, 2^278973940 is an apocalyptic number.

278973940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278973940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338236416).

278973940 is an abundant number, since it is smaller than the sum of its proper divisors (397498892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278973940 is a wasteful number, since it uses less digits than its factorization.

278973940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20656 (or 20654 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 278973940 is about 16702.5129845781. The cubic root of 278973940 is about 653.4131624191.

It can be divided in two parts, 2789 and 73940, that added together give a square (76729 = 277²).

The spelling of 278973940 in words is "two hundred seventy-eight million, nine hundred seventy-three thousand, nine hundred forty".