4057987 has 4 divisors (see below), whose sum is σ = 4089096. Its totient is φ = 4026880.

The previous prime is 4057969. The next prime is 4058011. The reversal of 4057987 is 7897504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4057987 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 (4057927) 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, 15358 + ... + 15619.

It is an arithmetic number, because the mean of its divisors is an integer number (1022274).

Almost surely, 2^4057987 is an apocalyptic number.

4057987 is a deficient number, since it is larger than the sum of its proper divisors (31109).

4057987 is a wasteful number, since it uses less digits than its factorization.

4057987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31108.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 4057987 is about 2014.4445884660. Note that the first 3 decimals coincide. The cubic root of 4057987 is about 159.5034999543.

The spelling of 4057987 in words is "four million, fifty-seven thousand, nine hundred eighty-seven".