1987261854786 has 32 divisors (see below), whose sum is σ = 4755840337920. Its totient is φ = 611465185872.

The previous prime is 1987261854763. The next prime is 1987261854917. The reversal of 1987261854786 is 6874581627891.

It is a happy number.

1987261854786 is a `hidden beast` number, since 1 + 9 + 8 + 72 + 6 + 1 + 8 + 547 + 8 + 6 = 666.

It is a super-2 number, since 2×1987261854786² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415427970 + ... + 1415429373.

It is an arithmetic number, because the mean of its divisors is an integer number (148620010560).

Almost surely, 2^{1987261854786} is an apocalyptic number.

1987261854786 is an abundant number, since it is smaller than the sum of its proper divisors (2768578483134).

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

1987261854786 is a wasteful number, since it uses less digits than its factorization.

1987261854786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830857367 (or 2830857361 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 72.

The spelling of 1987261854786 in words is "one trillion, nine hundred eighty-seven billion, two hundred sixty-one million, eight hundred fifty-four thousand, seven hundred eighty-six".