3397781 has 2 divisors, whose sum is σ = 3397782. Its totient is φ = 3397780.

The previous prime is 3397769. The next prime is 3397783. The reversal of 3397781 is 1877933.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3363556 + 34225 = 1834^2 + 185^2 .

It is an emirp because it is prime and its reverse (1877933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3397781 - 2⁶ = 3397717 is a prime.

It is a super-2 number, since 2×3397781² = 23089831447922, which contains 22 as substring.

Together with 3397783, 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 (3397783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1698890 + 1698891.

It is an arithmetic number, because the mean of its divisors is an integer number (1698891).

Almost surely, 2^3397781 is an apocalyptic number.

It is an amenable number.

3397781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3397781 is an equidigital number, since it uses as much as digits as its factorization.

3397781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 3397781 is about 1843.3070823929. The cubic root of 3397781 is about 150.3367397728.

The spelling of 3397781 in words is "three million, three hundred ninety-seven thousand, seven hundred eighty-one".