4000280 has 32 divisors (see below), whose sum is σ = 9102240. Its totient is φ = 1582080.

The previous prime is 4000277. The next prime is 4000291. The reversal of 4000280 is 820004.

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, 3365 + ... + 4395.

It is an arithmetic number, because the mean of its divisors is an integer number (284445).

Almost surely, 2^4000280 is an apocalyptic number.

4000280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4000280 is an abundant number, since it is smaller than the sum of its proper divisors (5101960).

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

4000280 is a wasteful number, since it uses less digits than its factorization.

4000280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1135 counting only the distinct ones).

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

The square root of 4000280 is about 2000.0699987750. The cubic root of 4000280 is about 158.7438090462.

Adding to 4000280 its reverse (820004), we get a palindrome (4820284).

The spelling of 4000280 in words is "four million, two hundred eighty", and thus it is an aban number.