1057985405 has 4 divisors (see below), whose sum is σ = 1269582492. Its totient is φ = 846388320.

The previous prime is 1057985393. The next prime is 1057985419. The reversal of 1057985405 is 5045897501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045897501 = 67 ⋅75311903.

It can be written as a sum of positive squares in 2 ways, for example, as 282307204 + 775678201 = 16802^2 + 27851^2 .

It is not a de Polignac number, because 1057985405 - 2¹⁰ = 1057984381 is a prime.

It is a super-2 number, since 2×1057985405² = 2238666234386028050, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 105798536 + ... + 105798545.

It is an arithmetic number, because the mean of its divisors is an integer number (317395623).

Almost surely, 2^1057985405 is an apocalyptic number.

It is an amenable number.

1057985405 is a deficient number, since it is larger than the sum of its proper divisors (211597087).

1057985405 is an equidigital number, since it uses as much as digits as its factorization.

1057985405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211597086.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1057985405 is about 32526.6875811233. The cubic root of 1057985405 is about 1018.9664672057.

The spelling of 1057985405 in words is "one billion, fifty-seven million, nine hundred eighty-five thousand, four hundred five".