1806890077 has 4 divisors (see below), whose sum is σ = 1806975616. Its totient is φ = 1806804540.

The previous prime is 1806890039. The next prime is 1806890081. The reversal of 1806890077 is 7700986081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1806890077 - 2¹¹ = 1806888029 is a prime.

It is a super-2 number, since 2×1806890077² = 6529703500722131858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806890017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14302 + ... + 61792.

It is an arithmetic number, because the mean of its divisors is an integer number (451743904).

Almost surely, 2^1806890077 is an apocalyptic number.

It is an amenable number.

1806890077 is a deficient number, since it is larger than the sum of its proper divisors (85539).

1806890077 is an equidigital number, since it uses as much as digits as its factorization.

1806890077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85538.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 1806890077 is about 42507.5296506395. The cubic root of 1806890077 is about 1217.9905281101.

The spelling of 1806890077 in words is "one billion, eight hundred six million, eight hundred ninety thousand, seventy-seven".