3928381 has 2 divisors, whose sum is σ = 3928382. Its totient is φ = 3928380.

The previous prime is 3928373. The next prime is 3928391. The reversal of 3928381 is 1838293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2325625 + 1602756 = 1525^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 3928381 - 2³ = 3928373 is a prime.

It is a super-2 number, since 2×3928381² = 30864354562322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3928361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964190 + 1964191.

It is an arithmetic number, because the mean of its divisors is an integer number (1964191).

Almost surely, 2^3928381 is an apocalyptic number.

It is an amenable number.

3928381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3928381 is an equidigital number, since it uses as much as digits as its factorization.

3928381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 3928381 is about 1982.0143793626. The cubic root of 3928381 is about 157.7869933158.

The spelling of 3928381 in words is "three million, nine hundred twenty-eight thousand, three hundred eighty-one".