280157 has 4 divisors (see below), whose sum is σ = 281436. Its totient is φ = 278880.

The previous prime is 280139. The next prime is 280183. The reversal of 280157 is 751082.

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 can be written as a sum of positive squares in 2 ways, for example, as 217156 + 63001 = 466^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 280157 - 2¹⁸ = 18013 is a prime.

It is a Duffinian number.

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 280157.

It is not an unprimeable number, because it can be changed into a prime (280187) 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, 218 + ... + 779.

It is an arithmetic number, because the mean of its divisors is an integer number (70359).

2²⁸⁰¹⁵⁷ is an apocalyptic number.

It is an amenable number.

280157 is a deficient number, since it is larger than the sum of its proper divisors (1279).

280157 is an equidigital number, since it uses as much as digits as its factorization.

280157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 280157 is about 529.2985924788. The cubic root of 280157 is about 65.4335514765.

The spelling of 280157 in words is "two hundred eighty thousand, one hundred fifty-seven".