4055991 has 4 divisors (see below), whose sum is σ = 5407992. Its totient is φ = 2703992.

The previous prime is 4055983. The next prime is 4055993. The reversal of 4055991 is 1995504.

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

It is a cyclic number.

It is not a de Polignac number, because 4055991 - 2³ = 4055983 is a prime.

It is a D-number.

4055991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4055993) 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, 675996 + ... + 676001.

It is an arithmetic number, because the mean of its divisors is an integer number (1351998).

Almost surely, 2^4055991 is an apocalyptic number.

4055991 is a deficient number, since it is larger than the sum of its proper divisors (1352001).

4055991 is a wasteful number, since it uses less digits than its factorization.

4055991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352000.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 4055991 is about 2013.9491056131. The cubic root of 4055991 is about 159.4773440303.

The spelling of 4055991 in words is "four million, fifty-five thousand, nine hundred ninety-one".