4000281 has 16 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 2583360.

The previous prime is 4000277. The next prime is 4000291. The reversal of 4000281 is 1820004.

It is not a de Polignac number, because 4000281 - 2² = 4000277 is a prime.

It is a super-2 number, since 2×4000281² = 32004496157922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4000281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22011 + ... + 22191.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^4000281 is an apocalyptic number.

It is an amenable number.

4000281 is a deficient number, since it is larger than the sum of its proper divisors (1503399).

4000281 is a wasteful number, since it uses less digits than its factorization.

4000281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 4000281 is about 2000.0702487663. The cubic root of 4000281 is about 158.7438222739.

Adding to 4000281 its reverse (1820004), we get a palindrome (5820285).

The spelling of 4000281 in words is "four million, two hundred eighty-one", and thus it is an aban number.