1642743905 has 16 divisors (see below), whose sum is σ = 2170238400. Its totient is φ = 1183757760.

The previous prime is 1642743901. The next prime is 1642743937. The reversal of 1642743905 is 5093472461.

It is not a de Polignac number, because 1642743905 - 2² = 1642743901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1642743901) 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 15 ways as a sum of consecutive naturals, for example, 131015 + ... + 143004.

It is an arithmetic number, because the mean of its divisors is an integer number (135639900).

Almost surely, 2^1642743905 is an apocalyptic number.

It is an amenable number.

1642743905 is a deficient number, since it is larger than the sum of its proper divisors (527494495).

1642743905 is a wasteful number, since it uses less digits than its factorization.

1642743905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274144.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1642743905 is about 40530.7772563024. Note that the first 3 decimals coincide. The cubic root of 1642743905 is about 1179.9310275208.

It can be divided in two parts, 1642 and 743905, that added together give a palindrome (745547).

The spelling of 1642743905 in words is "one billion, six hundred forty-two million, seven hundred forty-three thousand, nine hundred five".