1642893605 has 4 divisors (see below), whose sum is σ = 1971472332. Its totient is φ = 1314314880.

The previous prime is 1642893599. The next prime is 1642893607. The reversal of 1642893605 is 5063982461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5063982461 = 4523 ⋅1119607.

It can be written as a sum of positive squares in 2 ways, for example, as 612612001 + 1030281604 = 24751^2 + 32098^2 .

It is not a de Polignac number, because 1642893605 - 2⁴ = 1642893589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642893607) 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, 164289356 + ... + 164289365.

It is an arithmetic number, because the mean of its divisors is an integer number (492868083).

Almost surely, 2^1642893605 is an apocalyptic number.

It is an amenable number.

1642893605 is a deficient number, since it is larger than the sum of its proper divisors (328578727).

1642893605 is an equidigital number, since it uses as much as digits as its factorization.

1642893605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328578726.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 1642893605 is about 40532.6239589790. The cubic root of 1642893605 is about 1179.9668680250.

The spelling of 1642893605 in words is "one billion, six hundred forty-two million, eight hundred ninety-three thousand, six hundred five".