3397840681 has 9 divisors (see below), whose sum is σ = 3450574519. Its totient is φ = 3345903400.

The previous prime is 3397840679. The next prime is 3397840697. The reversal of 3397840681 is 1860487933.

It is a happy number.

The square root of 3397840681 is 58291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 927750681 + 2470090000 = 30459^2 + 49700^2 .

It is not a de Polignac number, because 3397840681 - 2¹ = 3397840679 is a prime.

It is a super-2 number, since 2×3397840681² = 23090642586917087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3397840181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4138251 + ... + 4139071.

Almost surely, 2^3397840681 is an apocalyptic number.

3397840681 is the 58291-st square number.

3397840681 is the 29146-th centered octagonal number.

It is an amenable number.

3397840681 is a deficient number, since it is larger than the sum of its proper divisors (52733838).

3397840681 is an frugal number, since it uses more digits than its factorization.

3397840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The cubic root of 3397840681 is about 1503.3761997414.

Multiplying 3397840681 by its sum of digits (49), we get a square (166494193369 = 408037²).

The spelling of 3397840681 in words is "three billion, three hundred ninety-seven million, eight hundred forty thousand, six hundred eighty-one".