3948391231 has 4 divisors (see below), whose sum is σ = 3948529264. Its totient is φ = 3948253200.

The previous prime is 3948391211. The next prime is 3948391243. The reversal of 3948391231 is 1321938493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1321938493 = 199 ⋅6642907.

It is a cyclic number.

It is not a de Polignac number, because 3948391231 - 2⁵ = 3948391199 is a prime.

It is a super-2 number, since 2×3948391231² = 31179586626075390722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3948391201) 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, 8310 + ... + 89251.

It is an arithmetic number, because the mean of its divisors is an integer number (987132316).

Almost surely, 2^3948391231 is an apocalyptic number.

3948391231 is a deficient number, since it is larger than the sum of its proper divisors (138033).

3948391231 is an equidigital number, since it uses as much as digits as its factorization.

3948391231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138032.

The product of its digits is 139968, while the sum is 43.

The square root of 3948391231 is about 62836.2254674801. The cubic root of 3948391231 is about 1580.5444941452.

The spelling of 3948391231 in words is "three billion, nine hundred forty-eight million, three hundred ninety-one thousand, two hundred thirty-one".