1643434 has 16 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 733680.

The previous prime is 1643431. The next prime is 1643461. The reversal of 1643434 is 4343461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1643399 and 1643408.

It is not an unprimeable number, because it can be changed into a prime (1643431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

2^1643434 is an apocalyptic number.

1643434 is a deficient number, since it is larger than the sum of its proper divisors (1098326).

1643434 is a wasteful number, since it uses less digits than its factorization.

1643434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085.

The product of its digits is 3456, while the sum is 25.

The square root of 1643434 is about 1281.9648981154. The cubic root of 1643434 is about 118.0096228866.

Adding to 1643434 its reverse (4343461), we get a palindrome (5986895).

The spelling of 1643434 in words is "one million, six hundred forty-three thousand, four hundred thirty-four".