3400643 has 4 divisors (see below), whose sum is σ = 3404640. Its totient is φ = 3396648.

The previous prime is 3400637. The next prime is 3400673. The reversal of 3400643 is 3460043.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3460043 = 71 ⋅48733.

It is a cyclic number.

It is not a de Polignac number, because 3400643 - 2¹⁴ = 3384259 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3400603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155 + ... + 2612.

It is an arithmetic number, because the mean of its divisors is an integer number (851160).

Almost surely, 2^3400643 is an apocalyptic number.

3400643 is a deficient number, since it is larger than the sum of its proper divisors (3997).

3400643 is a wasteful number, since it uses less digits than its factorization.

3400643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 3400643 is about 1844.0832410713. The cubic root of 3400643 is about 150.3789381958.

Adding to 3400643 its reverse (3460043), we get a palindrome (6860686).

The spelling of 3400643 in words is "three million, four hundred thousand, six hundred forty-three".