278997 has 8 divisors (see below), whose sum is σ = 375744. Its totient is φ = 184128.

The previous prime is 278981. The next prime is 279001. The reversal of 278997 is 799872.

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

It is not a de Polignac number, because 278997 - 2⁴ = 278981 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278997.

It is not an unprimeable number, because it can be changed into a prime (278917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73 + ... + 750.

It is an arithmetic number, because the mean of its divisors is an integer number (46968).

2²⁷⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

278997 is a deficient number, since it is larger than the sum of its proper divisors (96747).

278997 is a wasteful number, since it uses less digits than its factorization.

278997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its digits is 63504, while the sum is 42.

The square root of 278997 is about 528.2016660330. The cubic root of 278997 is about 65.3431165645.

It can be divided in two parts, 278 and 997, that added together give a triangular number (1275 = T₅₀).

The spelling of 278997 in words is "two hundred seventy-eight thousand, nine hundred ninety-seven".