1855457993 has 8 divisors (see below), whose sum is σ = 1914592680. Its totient is φ = 1796984320.

The previous prime is 1855457983. The next prime is 1855457999. The reversal of 1855457993 is 3997545581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25928464 + 1829529529 = 5092^2 + 42773^2 .

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 1855457993 - 2²⁴ = 1838680777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1855457999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159548 + ... + 170781.

It is an arithmetic number, because the mean of its divisors is an integer number (239324085).

Almost surely, 2^1855457993 is an apocalyptic number.

It is an amenable number.

1855457993 is a deficient number, since it is larger than the sum of its proper divisors (59134687).

1855457993 is a wasteful number, since it uses less digits than its factorization.

1855457993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330507.

The product of its digits is 6804000, while the sum is 56.

The square root of 1855457993 is about 43075.0274869326. The cubic root of 1855457993 is about 1228.8070909532.

The spelling of 1855457993 in words is "one billion, eight hundred fifty-five million, four hundred fifty-seven thousand, nine hundred ninety-three".