3941938781 has 4 divisors (see below), whose sum is σ = 4300296864. Its totient is φ = 3583580700.

The previous prime is 3941938771. The next prime is 3941938787. The reversal of 3941938781 is 1878391493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3941938781 is a prime.

It is a super-2 number, since 2×3941938781² = 31077762706303531922, 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 (3941938787) 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, 179179025 + ... + 179179046.

It is an arithmetic number, because the mean of its divisors is an integer number (1075074216).

Almost surely, 2^3941938781 is an apocalyptic number.

It is an amenable number.

3941938781 is a deficient number, since it is larger than the sum of its proper divisors (358358083).

3941938781 is a wasteful number, since it uses less digits than its factorization.

3941938781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358358082.

The product of its digits is 1306368, while the sum is 53.

The square root of 3941938781 is about 62784.8610813148. The cubic root of 3941938781 is about 1579.6830509089.

The spelling of 3941938781 in words is "three billion, nine hundred forty-one million, nine hundred thirty-eight thousand, seven hundred eighty-one".