3898981 has 2 divisors, whose sum is σ = 3898982. Its totient is φ = 3898980.

The previous prime is 3898957. The next prime is 3898991. The reversal of 3898981 is 1898983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2076481 + 1822500 = 1441^2 + 1350^2 .

It is an emirp because it is prime and its reverse (1898983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3898981 is a prime.

It is a super-2 number, since 2×3898981² = 30404105676722, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

3898981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3898991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1949490 + 1949491.

It is an arithmetic number, because the mean of its divisors is an integer number (1949491).

Almost surely, 2^3898981 is an apocalyptic number.

It is an amenable number.

3898981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898981 is an equidigital number, since it uses as much as digits as its factorization.

3898981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 3898981 is about 1974.5837536048. The cubic root of 3898981 is about 157.3923813401.

The spelling of 3898981 in words is "three million, eight hundred ninety-eight thousand, nine hundred eighty-one".