3890981 has 2 divisors, whose sum is σ = 3890982. Its totient is φ = 3890980.

The previous prime is 3890969. The next prime is 3891037. The reversal of 3890981 is 1890983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2669956 + 1221025 = 1634^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3890981 is a prime.

It is a super-2 number, since 2×3890981² = 30279466284722, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3890951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945490 + 1945491.

It is an arithmetic number, because the mean of its divisors is an integer number (1945491).

Almost surely, 2^3890981 is an apocalyptic number.

It is an amenable number.

3890981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3890981 is an equidigital number, since it uses as much as digits as its factorization.

3890981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 3890981 is about 1972.5569700265. The cubic root of 3890981 is about 157.2846607837.

It can be divided in two parts, 38 and 90981, that added together give a palindrome (91019).

The spelling of 3890981 in words is "three million, eight hundred ninety thousand, nine hundred eighty-one".