4057391 has 4 divisors (see below), whose sum is σ = 4369512. Its totient is φ = 3745272.

The previous prime is 4057381. The next prime is 4057397. The reversal of 4057391 is 1937504.

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 4057391 - 2¹⁴ = 4041007 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 (4057397) 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, 156041 + ... + 156066.

It is an arithmetic number, because the mean of its divisors is an integer number (1092378).

Almost surely, 2^4057391 is an apocalyptic number.

4057391 is a deficient number, since it is larger than the sum of its proper divisors (312121).

4057391 is a wasteful number, since it uses less digits than its factorization.

4057391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312120.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 4057391 is about 2014.2966514394. The cubic root of 4057391 is about 159.4956907671.

The spelling of 4057391 in words is "four million, fifty-seven thousand, three hundred ninety-one".