278425 has 24 divisors (see below), whose sum is σ = 414656. Its totient is φ = 181440.

The previous prime is 278413. The next prime is 278437. The reversal of 278425 is 524872.

278425 = 21² + 22² + ... + 94².

It is an interprime number because it is at equal distance from previous prime (278413) and next prime (278437).

It is not a de Polignac number, because 278425 - 2⁵ = 278393 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 278393 and 278402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6454 + ... + 6496.

2²⁷⁸⁴²⁵ is an apocalyptic number.

278425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

278425 is a deficient number, since it is larger than the sum of its proper divisors (136231).

278425 is a wasteful number, since it uses less digits than its factorization.

278425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 92 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 278425 is about 527.6599283630. The cubic root of 278425 is about 65.2984304988.

It can be divided in two parts, 2784 and 25, that added together give a square (2809 = 53²).

The spelling of 278425 in words is "two hundred seventy-eight thousand, four hundred twenty-five".