1887798157 has 6 divisors (see below), whose sum is σ = 2196010158. Its totient is φ = 1618112664.

The previous prime is 1887798151. The next prime is 1887798229. The reversal of 1887798157 is 7518977881.

It can be written as a sum of positive squares in only one way, i.e., 1885383241 + 2414916 = 43421^2 + 1554^2 .

It is not a de Polignac number, because 1887798157 - 2¹⁵ = 1887765389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1887798095 and 1887798104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1887798151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19263198 + ... + 19263295.

It is an arithmetic number, because the mean of its divisors is an integer number (366001693).

Almost surely, 2^1887798157 is an apocalyptic number.

It is an amenable number.

1887798157 is a deficient number, since it is larger than the sum of its proper divisors (308212001).

1887798157 is an equidigital number, since it uses as much as digits as its factorization.

1887798157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38526507 (or 38526500 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 61.

The square root of 1887798157 is about 43448.7992584375. The cubic root of 1887798157 is about 1235.9052751616.

The spelling of 1887798157 in words is "one billion, eight hundred eighty-seven million, seven hundred ninety-eight thousand, one hundred fifty-seven".