3891039 has 4 divisors (see below), whose sum is σ = 5188056. Its totient is φ = 2594024.

The previous prime is 3891037. The next prime is 3891049. The reversal of 3891039 is 9301983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9301983 = 3 ⋅3100661.

It is a cyclic number.

It is not a de Polignac number, because 3891039 - 2¹ = 3891037 is a prime.

It is a D-number.

3891039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648504 + ... + 648509.

It is an arithmetic number, because the mean of its divisors is an integer number (1297014).

Almost surely, 2^3891039 is an apocalyptic number.

3891039 is a deficient number, since it is larger than the sum of its proper divisors (1297017).

3891039 is a wasteful number, since it uses less digits than its factorization.

3891039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297016.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 3891039 is about 1972.5716717017. The cubic root of 3891039 is about 157.2854422889.

The spelling of 3891039 in words is "three million, eight hundred ninety-one thousand, thirty-nine".