1986123427902 has 24 divisors (see below), whose sum is σ = 4303348422984. Its totient is φ = 662028681744.

The previous prime is 1986123427901. The next prime is 1986123427903. The reversal of 1986123427902 is 2097243216891.

1986123427902 is a `hidden beast` number, since 1 + 9 + 8 + 6 + 123 + 427 + 90 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1986123427901) and next prime (1986123427903).

It is a super-2 number, since 2×1986123427902² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986123427901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28993 + ... + 1993260.

It is an arithmetic number, because the mean of its divisors is an integer number (179306184291).

Almost surely, 2^{1986123427902} is an apocalyptic number.

1986123427902 is an abundant number, since it is smaller than the sum of its proper divisors (2317224995082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1986123427902 is a wasteful number, since it uses less digits than its factorization.

1986123427902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076824 (or 2076821 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 1986123427902 in words is "one trillion, nine hundred eighty-six billion, one hundred twenty-three million, four hundred twenty-seven thousand, nine hundred two".