1987886123 has 2 divisors, whose sum is σ = 1987886124. Its totient is φ = 1987886122.

The previous prime is 1987886119. The next prime is 1987886137. The reversal of 1987886123 is 3216887891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1987886123 - 2² = 1987886119 is a prime.

It is a super-2 number, since 2×1987886123² = 7903382476031942258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1987886323) 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 as a sum of consecutive naturals, namely, 993943061 + 993943062.

It is an arithmetic number, because the mean of its divisors is an integer number (993943062).

Almost surely, 2^1987886123 is an apocalyptic number.

1987886123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987886123 is an equidigital number, since it uses as much as digits as its factorization.

1987886123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 53.

The square root of 1987886123 is about 44585.7165805373. The cubic root of 1987886123 is about 1257.3721419829.

The spelling of 1987886123 in words is "one billion, nine hundred eighty-seven million, eight hundred eighty-six thousand, one hundred twenty-three".