3420857 has 4 divisors (see below), whose sum is σ = 3731856. Its totient is φ = 3109860.

The previous prime is 3420839. The next prime is 3420871. The reversal of 3420857 is 7580243.

It is a happy number.

3420857 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7580243 = 11 ⋅689113.

It is a cyclic number.

It is not a de Polignac number, because 3420857 - 2⁶ = 3420793 is a prime.

It is a super-2 number, since 2×3420857² = 23404525228898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420827) 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, 155483 + ... + 155504.

It is an arithmetic number, because the mean of its divisors is an integer number (932964).

Almost surely, 2^3420857 is an apocalyptic number.

It is an amenable number.

3420857 is a deficient number, since it is larger than the sum of its proper divisors (310999).

3420857 is a wasteful number, since it uses less digits than its factorization.

3420857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310998.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 3420857 is about 1849.5558926402. Note that the first 3 decimals coincide. The cubic root of 3420857 is about 150.6763090869.

The spelling of 3420857 in words is "three million, four hundred twenty thousand, eight hundred fifty-seven".