3694781 has 4 divisors (see below), whose sum is σ = 3699612. Its totient is φ = 3689952.

The previous prime is 3694741. The next prime is 3694787. The reversal of 3694781 is 1874963.

3694781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1874963 = 89 ⋅21067.

It can be written as a sum of positive squares in 2 ways, for example, as 1229881 + 2464900 = 1109^2 + 1570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3694781 is a prime.

It is a super-2 number, since 2×3694781² = 27302813275922, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3694787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (924903).

Almost surely, 2^3694781 is an apocalyptic number.

It is an amenable number.

3694781 is a deficient number, since it is larger than the sum of its proper divisors (4831).

3694781 is an equidigital number, since it uses as much as digits as its factorization.

3694781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830.

The product of its digits is 36288, while the sum is 38.

The square root of 3694781 is about 1922.1813129879. The cubic root of 3694781 is about 154.5952813123.

The spelling of 3694781 in words is "three million, six hundred ninety-four thousand, seven hundred eighty-one".