4156321 has 8 divisors (see below), whose sum is σ = 4597544. Its totient is φ = 3732480.

The previous prime is 4156301. The next prime is 4156331. The reversal of 4156321 is 1236514.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 4100625 = 236^2 + 2025^2 .

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

It is a 6-Lehmer number, since φ(4156321) divides (4156321-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 4156321 - 2¹³ = 4148129 is a prime.

It is a Duffinian number.

4156321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4156292 and 4156301.

It is not an unprimeable number, because it can be changed into a prime (4156301) 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, 3840 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (574693).

Almost surely, 2^4156321 is an apocalyptic number.

It is an amenable number.

4156321 is a deficient number, since it is larger than the sum of its proper divisors (441223).

4156321 is a wasteful number, since it uses less digits than its factorization.

4156321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691.

The product of its digits is 720, while the sum is 22.

The square root of 4156321 is about 2038.7057168704. The cubic root of 4156321 is about 160.7816053024.

The spelling of 4156321 in words is "four million, one hundred fifty-six thousand, three hundred twenty-one".