280402 has 16 divisors (see below), whose sum is σ = 455040. Its totient is φ = 129168.

The previous prime is 280373. The next prime is 280409. The reversal of 280402 is 204082.

It is not an unprimeable number, because it can be changed into a prime (280409) 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, 1708 + ... + 1864.

It is an arithmetic number, because the mean of its divisors is an integer number (28440).

2²⁸⁰⁴⁰² is an apocalyptic number.

280402 is a deficient number, since it is larger than the sum of its proper divisors (174638).

280402 is a wasteful number, since it uses less digits than its factorization.

280402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 280402 is about 529.5299802655. The cubic root of 280402 is about 65.4526200098.

Adding to 280402 its reverse (204082), we get a palindrome (484484).

The spelling of 280402 in words is "two hundred eighty thousand, four hundred two".