1820675693 has 4 divisors (see below), whose sum is σ = 1824731100. Its totient is φ = 1816620288.

The previous prime is 1820675671. The next prime is 1820675743. The reversal of 1820675693 is 3965760281.

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 1008824644 + 811851049 = 31762^2 + 28493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820675693 - 2⁶ = 1820675629 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 (1820675093) 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, 2027030 + ... + 2027927.

It is an arithmetic number, because the mean of its divisors is an integer number (456182775).

Almost surely, 2^1820675693 is an apocalyptic number.

It is an amenable number.

1820675693 is a deficient number, since it is larger than the sum of its proper divisors (4055407).

1820675693 is an equidigital number, since it uses as much as digits as its factorization.

1820675693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055406.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1820675693 is about 42669.3765246224. The cubic root of 1820675693 is about 1221.0802250596.

The spelling of 1820675693 in words is "one billion, eight hundred twenty million, six hundred seventy-five thousand, six hundred ninety-three".