280401400 has 48 divisors (see below), whose sum is σ = 690290640. Its totient is φ = 105561600.

The previous prime is 280401391. The next prime is 280401403. The reversal of 280401400 is 4104082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280401403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37836 + ... + 44635.

It is an arithmetic number, because the mean of its divisors is an integer number (14381055).

Almost surely, 2^280401400 is an apocalyptic number.

280401400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280401400 is an abundant number, since it is smaller than the sum of its proper divisors (409889240).

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

280401400 is a wasteful number, since it uses less digits than its factorization.

280401400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82504 (or 82495 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 280401400 is about 16745.1903542480. The cubic root of 280401400 is about 654.5257332489.

Adding to 280401400 its reverse (4104082), we get a palindrome (284505482).

The spelling of 280401400 in words is "two hundred eighty million, four hundred one thousand, four hundred".