1868487077 has 8 divisors (see below), whose sum is σ = 1880872056. Its totient is φ = 1856143552.

The previous prime is 1868487043. The next prime is 1868487091. The reversal of 1868487077 is 7707848681.

It is a happy number.

It is a Cunningham number, because it is equal to 43226²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 104571076 + 1763916001 = 10226^2 + 41999^2 .

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 1868487077 - 2¹² = 1868482981 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 (1868480077) 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, 82823 + ... + 102939.

It is an arithmetic number, because the mean of its divisors is an integer number (235109007).

Almost surely, 2^1868487077 is an apocalyptic number.

It is an amenable number.

1868487077 is a deficient number, since it is larger than the sum of its proper divisors (12384979).

1868487077 is a wasteful number, since it uses less digits than its factorization.

1868487077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20727.

The product of its (nonzero) digits is 4214784, while the sum is 56.

The square root of 1868487077 is about 43226.0000115671. Note that the first 4 decimals coincide. The cubic root of 1868487077 is about 1231.6766253397.

The spelling of 1868487077 in words is "one billion, eight hundred sixty-eight million, four hundred eighty-seven thousand, seventy-seven".