3400840 has 16 divisors (see below), whose sum is σ = 7651980. Its totient is φ = 1360320.

The previous prime is 3400823. The next prime is 3400841. The reversal of 3400840 is 480043.

It can be written as a sum of positive squares in 2 ways, for example, as 3334276 + 66564 = 1826^2 + 258^2 .

It is not an unprimeable number, because it can be changed into a prime (3400841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42471 + ... + 42550.

Almost surely, 2^3400840 is an apocalyptic number.

It is an amenable number.

3400840 is an abundant number, since it is smaller than the sum of its proper divisors (4251140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3400840 is a wasteful number, since it uses less digits than its factorization.

3400840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85032 (or 85028 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 3400840 is about 1844.1366543724. The cubic root of 3400840 is about 150.3818419681.

Adding to 3400840 its reverse (480043), we get a palindrome (3880883).

The spelling of 3400840 in words is "three million, four hundred thousand, eight hundred forty".