3420781 has 8 divisors (see below), whose sum is σ = 4210304. Its totient is φ = 2706480.

The previous prime is 3420773. The next prime is 3420787. The reversal of 3420781 is 1870243.

3420781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3420781 - 2³ = 3420773 is a prime.

It is a super-2 number, since 2×3420781² = 23403485299922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420787) 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 7 ways as a sum of consecutive naturals, for example, 18705 + ... + 18886.

It is an arithmetic number, because the mean of its divisors is an integer number (526288).

Almost surely, 2^3420781 is an apocalyptic number.

It is an amenable number.

3420781 is a deficient number, since it is larger than the sum of its proper divisors (789523).

3420781 is a wasteful number, since it uses less digits than its factorization.

3420781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37611.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 3420781 is about 1849.5353470534. The cubic root of 3420781 is about 150.6751932375.

The spelling of 3420781 in words is "three million, four hundred twenty thousand, seven hundred eighty-one".