3938943121 has 3 divisors (see below), whose sum is σ = 3939005883. Its totient is φ = 3938880360.

The previous prime is 3938943109. The next prime is 3938943133. The reversal of 3938943121 is 1213498393.

The square root of 3938943121 is 62761.

It is a perfect power (a square), and thus also a powerful number.

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: 1213498393 = 937 ⋅1295089.

It is an interprime number because it is at equal distance from previous prime (3938943109) and next prime (3938943133).

It can be written as a sum of positive squares in only one way, i.e., 453221521 + 3485721600 = 21289^2 + 59040^2 .

It is not a de Polignac number, because 3938943121 - 2¹¹ = 3938941073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3938943101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31381 + ... + 94141.

It is an arithmetic number, because the mean of its divisors is an integer number (1313001961).

Almost surely, 2^3938943121 is an apocalyptic number.

3938943121 is the 62761-st square number.

3938943121 is the 31381-st centered octagonal number.

It is an amenable number.

3938943121 is a deficient number, since it is larger than the sum of its proper divisors (62762).

3938943121 is an frugal number, since it uses more digits than its factorization.

3938943121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125522 (or 62761 counting only the distinct ones).

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

The cubic root of 3938943121 is about 1579.2827916427.

The spelling of 3938943121 in words is "three billion, nine hundred thirty-eight million, nine hundred forty-three thousand, one hundred twenty-one".