1084121405 has 4 divisors (see below), whose sum is σ = 1300945692. Its totient is φ = 867297120.

The previous prime is 1084121387. The next prime is 1084121407. The reversal of 1084121405 is 5041214801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 800097796 + 284023609 = 28286^2 + 16853^2 .

It is not a de Polignac number, because 1084121405 - 2¹⁸ = 1083859261 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 (1084121407) 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, 108412136 + ... + 108412145.

It is an arithmetic number, because the mean of its divisors is an integer number (325236423).

Almost surely, 2^1084121405 is an apocalyptic number.

It is an amenable number.

1084121405 is a deficient number, since it is larger than the sum of its proper divisors (216824287).

1084121405 is an equidigital number, since it uses as much as digits as its factorization.

1084121405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216824286.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1084121405 is about 32925.9989218247. The cubic root of 1084121405 is about 1027.2890046130.

The spelling of 1084121405 in words is "one billion, eighty-four million, one hundred twenty-one thousand, four hundred five".