280440438 has 16 divisors (see below), whose sum is σ = 566435376. Its totient is φ = 92554400.

The previous prime is 280440421. The next prime is 280440463. The reversal of 280440438 is 834044082.

It is a junction number, because it is equal to n+sod(n) for n = 280440399 and 280440408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230781 + ... + 231992.

It is an arithmetic number, because the mean of its divisors is an integer number (35402211).

Almost surely, 2^280440438 is an apocalyptic number.

280440438 is an abundant number, since it is smaller than the sum of its proper divisors (285994938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280440438 is a wasteful number, since it uses less digits than its factorization.

280440438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462879.

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 280440438 is about 16746.3559618205. The cubic root of 280440438 is about 654.5561065992.

The spelling of 280440438 in words is "two hundred eighty million, four hundred forty thousand, four hundred thirty-eight".