1644434141 has 8 divisors (see below), whose sum is σ = 1885477440. Its totient is φ = 1404921888.

The previous prime is 1644434111. The next prime is 1644434147. The reversal of 1644434141 is 1414344461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644434141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1644434098 and 1644434107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644434147) 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, 380456 + ... + 384753.

It is an arithmetic number, because the mean of its divisors is an integer number (235684680).

Almost surely, 2^1644434141 is an apocalyptic number.

It is an amenable number.

1644434141 is a deficient number, since it is larger than the sum of its proper divisors (241043299).

1644434141 is an equidigital number, since it uses as much as digits as its factorization.

1644434141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765523.

The product of its digits is 18432, while the sum is 32.

The square root of 1644434141 is about 40551.6231611017. The cubic root of 1644434141 is about 1180.3355698394.

The spelling of 1644434141 in words is "one billion, six hundred forty-four million, four hundred thirty-four thousand, one hundred forty-one".