280375 has 8 divisors (see below), whose sum is σ = 350064. Its totient is φ = 224200.

The previous prime is 280373. The next prime is 280409. The reversal of 280375 is 573082.

It is not a de Polignac number, because 280375 - 2¹ = 280373 is a prime.

It is a super-2 number, since 2×280375² = 157220281250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

280375 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280373) 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, 997 + ... + 1246.

It is an arithmetic number, because the mean of its divisors is an integer number (43758).

2²⁸⁰³⁷⁵ is an apocalyptic number.

280375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

280375 is a deficient number, since it is larger than the sum of its proper divisors (69689).

280375 is an equidigital number, since it uses as much as digits as its factorization.

280375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 280375 is about 529.5044853446. The cubic root of 280375 is about 65.4505191243.

It can be divided in two parts, 28037 and 5, that multiplied together give a triangular number (140185 = T₅₂₉).

The spelling of 280375 in words is "two hundred eighty thousand, three hundred seventy-five".