3826573721 has 4 divisors (see below), whose sum is σ = 3827480244. Its totient is φ = 3825667200.

The previous prime is 3826573669. The next prime is 3826573727. The reversal of 3826573721 is 1273756283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273756283 = 34297 ⋅37139.

It can be written as a sum of positive squares in 2 ways, for example, as 3511866121 + 314707600 = 59261^2 + 17740^2 .

It is a cyclic number.

It is not a de Polignac number, because 3826573721 - 2⁶ = 3826573657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3826573727) 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, 446900 + ... + 455381.

It is an arithmetic number, because the mean of its divisors is an integer number (956870061).

Almost surely, 2^3826573721 is an apocalyptic number.

It is an amenable number.

3826573721 is a deficient number, since it is larger than the sum of its proper divisors (906523).

3826573721 is an equidigital number, since it uses as much as digits as its factorization.

3826573721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906522.

The product of its digits is 423360, while the sum is 44.

The square root of 3826573721 is about 61859.3058561119. The cubic root of 3826573721 is about 1564.1198521508.

The spelling of 3826573721 in words is "three billion, eight hundred twenty-six million, five hundred seventy-three thousand, seven hundred twenty-one".