3945726731 has 4 divisors (see below), whose sum is σ = 4052368032. Its totient is φ = 3839085432.

The previous prime is 3945726691. The next prime is 3945726749. The reversal of 3945726731 is 1376275493.

3945726731 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3945726731 - 2¹⁴ = 3945710347 is a prime.

It is a super-2 number, since 2×3945726731² = 31137518871455892722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3945726761) 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, 53320595 + ... + 53320668.

It is an arithmetic number, because the mean of its divisors is an integer number (1013092008).

Almost surely, 2^3945726731 is an apocalyptic number.

3945726731 is a deficient number, since it is larger than the sum of its proper divisors (106641301).

3945726731 is a wasteful number, since it uses less digits than its factorization.

3945726731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106641300.

The product of its digits is 952560, while the sum is 47.

The square root of 3945726731 is about 62815.0199474616. The cubic root of 3945726731 is about 1580.1888802396.

The spelling of 3945726731 in words is "three billion, nine hundred forty-five million, seven hundred twenty-six thousand, seven hundred thirty-one".