1642019405 has 8 divisors (see below), whose sum is σ = 2121994392. Its totient is φ = 1212568128.

The previous prime is 1642019363. The next prime is 1642019417. The reversal of 1642019405 is 5049102461.

It can be written as a sum of positive squares in 4 ways, for example, as 635209 + 1641384196 = 797^2 + 40514^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1642019405 - 2¹⁰ = 1642018381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12630854 + ... + 12630983.

It is an arithmetic number, because the mean of its divisors is an integer number (265249299).

Almost surely, 2^1642019405 is an apocalyptic number.

It is an amenable number.

1642019405 is a deficient number, since it is larger than the sum of its proper divisors (479974987).

1642019405 is a wasteful number, since it uses less digits than its factorization.

1642019405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25261855.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1642019405 is about 40521.8386182068. The cubic root of 1642019405 is about 1179.7575401966.

The spelling of 1642019405 in words is "one billion, six hundred forty-two million, nineteen thousand, four hundred five".