4000031 has 4 divisors (see below), whose sum is σ = 4571472. Its totient is φ = 3428592.

The previous prime is 3999971. The next prime is 4000037. The reversal of 4000031 is 1300004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000031 is a prime.

It is a super-2 number, since 2×4000031² = 32000496001922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3999982 and 4000018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285710 + ... + 285723.

It is an arithmetic number, because the mean of its divisors is an integer number (1142868).

Almost surely, 2^4000031 is an apocalyptic number.

4000031 is a deficient number, since it is larger than the sum of its proper divisors (571441).

4000031 is an equidigital number, since it uses as much as digits as its factorization.

4000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571440.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 4000031 is about 2000.0077499850. The cubic root of 4000031 is about 158.7405152744.

Adding to 4000031 its reverse (1300004), we get a palindrome (5300035).

It can be divided in two parts, 400003 and 1, that added together give a palindrome (400004).

The spelling of 4000031 in words is "four million, thirty-one", and thus it is an aban number.