4000090 has 8 divisors (see below), whose sum is σ = 7200180. Its totient is φ = 1600032.

The previous prime is 4000081. The next prime is 4000093. The reversal of 4000090 is 900004.

It is a happy number.

4000090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3837681 + 162409 = 1959^2 + 403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

4000090 is a modest number, since divided by 90 gives 40 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 4000090.

It is not an unprimeable number, because it can be changed into a prime (4000093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199995 + ... + 200014.

Almost surely, 2^4000090 is an apocalyptic number.

4000090 is a deficient number, since it is larger than the sum of its proper divisors (3200090).

4000090 is a wasteful number, since it uses less digits than its factorization.

4000090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400016.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 4000090 is about 2000.0224998734. The cubic root of 4000090 is about 158.7412957387.

Adding to 4000090 its reverse (900004), we get a palindrome (4900094).

The spelling of 4000090 in words is "four million, ninety", and thus it is an aban number.