3940281 has 6 divisors (see below), whose sum is σ = 5691530. Its totient is φ = 2626848.

The previous prime is 3940273. The next prime is 3940289. The reversal of 3940281 is 1820493.

It is an interprime number because it is at equal distance from previous prime (3940273) and next prime (3940289).

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 19881 = 1980^2 + 141^2 .

It is not a de Polignac number, because 3940281 - 2³ = 3940273 is a prime.

It is a super-2 number, since 2×3940281² = 31051628717922, which contains 22 as substring.

It is a Duffinian number.

3940281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3940289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218896 + ... + 218913.

Almost surely, 2^3940281 is an apocalyptic number.

It is an amenable number.

3940281 is a deficient number, since it is larger than the sum of its proper divisors (1751249).

3940281 is a wasteful number, since it uses less digits than its factorization.

3940281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437815 (or 437812 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 3940281 is about 1985.0141057433. The cubic root of 3940281 is about 157.9461574804.

The spelling of 3940281 in words is "three million, nine hundred forty thousand, two hundred eighty-one".