4038991 has 4 divisors (see below), whose sum is σ = 4406184. Its totient is φ = 3671800.

The previous prime is 4038989. The next prime is 4038997. The reversal of 4038991 is 1998304.

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

It is not a de Polignac number, because 4038991 - 2¹ = 4038989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4038997) 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 3 ways as a sum of consecutive naturals, for example, 183580 + ... + 183601.

It is an arithmetic number, because the mean of its divisors is an integer number (1101546).

Almost surely, 2^4038991 is an apocalyptic number.

4038991 is a deficient number, since it is larger than the sum of its proper divisors (367193).

4038991 is a wasteful number, since it uses less digits than its factorization.

4038991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367192.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 4038991 is about 2009.7241104191. The cubic root of 4038991 is about 159.2542245823.

The spelling of 4038991 in words is "four million, thirty-eight thousand, nine hundred ninety-one".