3993481 has 2 divisors, whose sum is σ = 3993482. Its totient is φ = 3993480.

The previous prime is 3993469. The next prime is 3993511. The reversal of 3993481 is 1843993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 13456 = 1995^2 + 116^2 .

It is an emirp because it is prime and its reverse (1843993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3993481 - 2¹⁷ = 3862409 is a prime.

It is a super-2 number, since 2×3993481² = 31895780994722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3993481.

It is not a weakly prime, because it can be changed into another prime (3993581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996740 + 1996741.

It is an arithmetic number, because the mean of its divisors is an integer number (1996741).

Almost surely, 2^3993481 is an apocalyptic number.

It is an amenable number.

3993481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993481 is an equidigital number, since it uses as much as digits as its factorization.

3993481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 3993481 is about 1998.3695854371. The cubic root of 3993481 is about 158.6538227447.

The spelling of 3993481 in words is "three million, nine hundred ninety-three thousand, four hundred eighty-one".