3420749 has 2 divisors, whose sum is σ = 3420750. Its totient is φ = 3420748.

The previous prime is 3420727. The next prime is 3420751. The reversal of 3420749 is 9470243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2951524 + 469225 = 1718^2 + 685^2 .

It is an emirp because it is prime and its reverse (9470243) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3420749 - 2⁸ = 3420493 is a prime.

Together with 3420751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3420799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710374 + 1710375.

It is an arithmetic number, because the mean of its divisors is an integer number (1710375).

Almost surely, 2^3420749 is an apocalyptic number.

It is an amenable number.

3420749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3420749 is an equidigital number, since it uses as much as digits as its factorization.

3420749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 3420749 is about 1849.5266962118. The cubic root of 3420749 is about 150.6747234012.

The spelling of 3420749 in words is "three million, four hundred twenty thousand, seven hundred forty-nine".