1986969333890 has 8 divisors (see below), whose sum is σ = 3576544801020. Its totient is φ = 794787733552.

The previous prime is 1986969333857. The next prime is 1986969333911. The reversal of 1986969333890 is 983339696891.

It can be written as a sum of positive squares in 2 ways, for example, as 1929273774289 + 57695559601 = 1388983^2 + 240199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99348466685 + ... + 99348466704.

Almost surely, 2^{1986969333890} is an apocalyptic number.

1986969333890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1986969333890 is a deficient number, since it is larger than the sum of its proper divisors (1589575467130).

1986969333890 is a wasteful number, since it uses less digits than its factorization.

1986969333890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198696933396.

The product of its (nonzero) digits is 408146688, while the sum is 74.

The spelling of 1986969333890 in words is "one trillion, nine hundred eighty-six billion, nine hundred sixty-nine million, three hundred thirty-three thousand, eight hundred ninety".