4087021 has 8 divisors (see below), whose sum is σ = 4428864. Its totient is φ = 3756480.

The previous prime is 4087019. The next prime is 4087037. The reversal of 4087021 is 1207804.

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

It is not a de Polignac number, because 4087021 - 2¹ = 4087019 is a prime.

It is an Ulam number.

It is a Duffinian number.

4087021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4086983 and 4087001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4087001) 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, 2065 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (553608).

Almost surely, 2^4087021 is an apocalyptic number.

It is an amenable number.

4087021 is a deficient number, since it is larger than the sum of its proper divisors (341843).

4087021 is a wasteful number, since it uses less digits than its factorization.

4087021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5651.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 4087021 is about 2021.6381971065. The cubic root of 4087021 is about 159.8830004027.

The spelling of 4087021 in words is "four million, eighty-seven thousand, twenty-one".