3933781 has 2 divisors, whose sum is σ = 3933782. Its totient is φ = 3933780.

The previous prime is 3933773. The next prime is 3933791. The reversal of 3933781 is 1873393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3837681 + 96100 = 1959^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 3933781 - 2³ = 3933773 is a prime.

It is a super-2 number, since 2×3933781² = 30949265911922, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3933731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1966890 + 1966891.

It is an arithmetic number, because the mean of its divisors is an integer number (1966891).

Almost surely, 2^3933781 is an apocalyptic number.

It is an amenable number.

3933781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3933781 is an equidigital number, since it uses as much as digits as its factorization.

3933781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 3933781 is about 1983.3761620026. The cubic root of 3933781 is about 157.8592588496.

The spelling of 3933781 in words is "three million, nine hundred thirty-three thousand, seven hundred eighty-one".