4132721 has 4 divisors (see below), whose sum is σ = 4150692. Its totient is φ = 4114752.

The previous prime is 4132693. The next prime is 4132769. The reversal of 4132721 is 1272314.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2283121 + 1849600 = 1511^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 4132721 - 2¹⁴ = 4116337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4132693 and 4132702.

It is not an unprimeable number, because it can be changed into a prime (4132421) 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, 8636 + ... + 9101.

It is an arithmetic number, because the mean of its divisors is an integer number (1037673).

Almost surely, 2^4132721 is an apocalyptic number.

It is an amenable number.

4132721 is a deficient number, since it is larger than the sum of its proper divisors (17971).

4132721 is a wasteful number, since it uses less digits than its factorization.

4132721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17970.

The product of its digits is 336, while the sum is 20.

The square root of 4132721 is about 2032.9094913449. The cubic root of 4132721 is about 160.4767162453.

The spelling of 4132721 in words is "four million, one hundred thirty-two thousand, seven hundred twenty-one".