4000890 has 32 divisors (see below), whose sum is σ = 9665856. Its totient is φ = 1059840.

The previous prime is 4000889. The next prime is 4000897. The reversal of 4000890 is 980004.

It is not an unprimeable number, because it can be changed into a prime (4000897) 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, 5445 + ... + 6135.

It is an arithmetic number, because the mean of its divisors is an integer number (302058).

Almost surely, 2^4000890 is an apocalyptic number.

4000890 is an abundant number, since it is smaller than the sum of its proper divisors (5664966).

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

4000890 is a wasteful number, since it uses less digits than its factorization.

4000890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 4000890 is about 2000.2224876248. Note that the first 3 decimals coincide. The cubic root of 4000890 is about 158.7518775482.

Adding to 4000890 its reverse (980004), we get a palindrome (4980894).

The spelling of 4000890 in words is "four million, eight hundred ninety", and thus it is an aban number.