4001987 has 8 divisors (see below), whose sum is σ = 4622832. Its totient is φ = 3424000.

The previous prime is 4001947. The next prime is 4001999. The reversal of 4001987 is 7891004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4001987 - 2¹² = 3997891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10514 + ... + 10887.

It is an arithmetic number, because the mean of its divisors is an integer number (577854).

Almost surely, 2^4001987 is an apocalyptic number.

4001987 is a deficient number, since it is larger than the sum of its proper divisors (620845).

4001987 is a wasteful number, since it uses less digits than its factorization.

4001987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21429.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 4001987 is about 2000.4966883252. The cubic root of 4001987 is about 158.7663855615.

The spelling of 4001987 in words is "four million, one thousand, nine hundred eighty-seven".