4023990 has 24 divisors (see below), whose sum is σ = 10462608. Its totient is φ = 1073040.

The previous prime is 4023973. The next prime is 4023997. The reversal of 4023990 is 993204.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22266 + ... + 22445.

It is an arithmetic number, because the mean of its divisors is an integer number (435942).

Almost surely, 2^4023990 is an apocalyptic number.

4023990 is an abundant number, since it is smaller than the sum of its proper divisors (6438618).

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

4023990 is a wasteful number, since it uses less digits than its factorization.

4023990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44724 (or 44721 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 4023990 is about 2005.9885343640. The cubic root of 4023990 is about 159.0568207979.

The spelling of 4023990 in words is "four million, twenty-three thousand, nine hundred ninety".