3913281 has 12 divisors (see below), whose sum is σ = 5985252. Its totient is φ = 2455296.

The previous prime is 3913277. The next prime is 3913309. The reversal of 3913281 is 1823193.

3913281 = T₆₇₀ + T₆₇₁ + ... + T₆₈₆.

It can be written as a sum of positive squares in 2 ways, for example, as 1404225 + 2509056 = 1185^2 + 1584^2 .

It is not a de Polignac number, because 3913281 - 2² = 3913277 is a prime.

It is a super-2 number, since 2×3913281² = 30627536369922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3913181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12636 + ... + 12941.

It is an arithmetic number, because the mean of its divisors is an integer number (498771).

Almost surely, 2^3913281 is an apocalyptic number.

It is an amenable number.

3913281 is a deficient number, since it is larger than the sum of its proper divisors (2071971).

3913281 is a wasteful number, since it uses less digits than its factorization.

3913281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25600 (or 25597 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3913281 is about 1978.2014558684. The cubic root of 3913281 is about 157.5845653200.

The spelling of 3913281 in words is "three million, nine hundred thirteen thousand, two hundred eighty-one".