4000990 has 32 divisors (see below), whose sum is σ = 8374464. Its totient is φ = 1347840.

The previous prime is 4000987. The next prime is 4000993. The reversal of 4000990 is 990004.

It is an interprime number because it is at equal distance from previous prime (4000987) and next prime (4000993).

4000990 is a modest number, since divided by 990 gives 400 as remainder.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3802 + ... + 4738.

It is an arithmetic number, because the mean of its divisors is an integer number (261702).

Almost surely, 2^4000990 is an apocalyptic number.

4000990 is an abundant number, since it is smaller than the sum of its proper divisors (4373474).

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

4000990 is a wasteful number, since it uses less digits than its factorization.

4000990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 4000990 is about 2000.2474846878. The cubic root of 4000990 is about 158.7532001752.

Adding to 4000990 its reverse (990004), we get a palindrome (4990994).

The spelling of 4000990 in words is "four million, nine hundred ninety", and thus it is an aban number.