3922991 has 4 divisors (see below), whose sum is σ = 3927000. Its totient is φ = 3918984.

The previous prime is 3922981. The next prime is 3922993. The reversal of 3922991 is 1992293.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1992293 = 617 ⋅3229.

It is a cyclic number.

It is not a de Polignac number, because 3922991 - 2¹⁴ = 3906607 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 (3922993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 2853.

It is an arithmetic number, because the mean of its divisors is an integer number (981750).

Almost surely, 2^3922991 is an apocalyptic number.

3922991 is a deficient number, since it is larger than the sum of its proper divisors (4009).

3922991 is a wasteful number, since it uses less digits than its factorization.

3922991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008.

The product of its digits is 8748, while the sum is 35.

The square root of 3922991 is about 1980.6541848591. The cubic root of 3922991 is about 157.7147955361.

It can be divided in two parts, 3922 and 991, that added together give a cube (4913 = 17³).

The spelling of 3922991 in words is "three million, nine hundred twenty-two thousand, nine hundred ninety-one".