1986998712490 has 64 divisors (see below), whose sum is σ = 3908886336000. Its totient is φ = 721223073280.

The previous prime is 1986998712463. The next prime is 1986998712499. The reversal of 1986998712490 is 942178996891.

It is not an unprimeable number, because it can be changed into a prime (1986998712499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253795896 + ... + 253803724.

It is an arithmetic number, because the mean of its divisors is an integer number (61076349000).

Almost surely, 2^{1986998712490} is an apocalyptic number.

1986998712490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1986998712490 is a deficient number, since it is larger than the sum of its proper divisors (1921887623510).

1986998712490 is a wasteful number, since it uses less digits than its factorization.

1986998712490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11775.

The product of its (nonzero) digits is 141087744, while the sum is 73.

The spelling of 1986998712490 in words is "one trillion, nine hundred eighty-six billion, nine hundred ninety-eight million, seven hundred twelve thousand, four hundred ninety".