278471 has 4 divisors (see below), whose sum is σ = 279744. Its totient is φ = 277200.

The previous prime is 278459. The next prime is 278479. The reversal of 278471 is 174872.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278471 is a prime.

It is a super-3 number, since 3×278471³ = 64783018235643333, which contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13 and base 15.

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 278471.

It is not an unprimeable number, because it can be changed into a prime (278479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (69936).

2²⁷⁸⁴⁷¹ is an apocalyptic number.

278471 is a deficient number, since it is larger than the sum of its proper divisors (1273).

278471 is an equidigital number, since it uses as much as digits as its factorization.

278471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its digits is 3136, while the sum is 29.

The square root of 278471 is about 527.7035152432. The cubic root of 278471 is about 65.3020263953.

The spelling of 278471 in words is "two hundred seventy-eight thousand, four hundred seventy-one".