400280 has 16 divisors (see below), whose sum is σ = 900720. Its totient is φ = 160096.

The previous prime is 400277. The next prime is 400291. The reversal of 400280 is 82004.

400280 = T₁₂₁ + T₁₂₂ + ... + T₁₆₀.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4964 + ... + 5043.

It is an arithmetic number, because the mean of its divisors is an integer number (56295).

2⁴⁰⁰²⁸⁰ is an apocalyptic number.

400280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400280 is an abundant number, since it is smaller than the sum of its proper divisors (500440).

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

400280 is a wasteful number, since it uses less digits than its factorization.

400280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10018 (or 10014 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 400280 is about 632.6768527455. The cubic root of 400280 is about 73.6978181099.

Adding to 400280 its reverse (82004), we get a palindrome (482284).

The spelling of 400280 in words is "four hundred thousand, two hundred eighty".