4057981 has 4 divisors (see below), whose sum is σ = 4075200. Its totient is φ = 4040764.

The previous prime is 4057969. The next prime is 4058011. The reversal of 4057981 is 1897504.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4057981 - 2⁷ = 4057853 is a prime.

It is a super-2 number, since 2×4057981² = 32934419592722, which contains 22 as substring.

It is a Duffinian number.

4057981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4057381) 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, 8251 + ... + 8728.

It is an arithmetic number, because the mean of its divisors is an integer number (1018800).

Almost surely, 2^4057981 is an apocalyptic number.

It is an amenable number.

4057981 is a deficient number, since it is larger than the sum of its proper divisors (17219).

4057981 is a wasteful number, since it uses less digits than its factorization.

4057981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17218.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 4057981 is about 2014.4430992212. The cubic root of 4057981 is about 159.5034213421.

The spelling of 4057981 in words is "four million, fifty-seven thousand, nine hundred eighty-one".