1987446820237 has 4 divisors (see below), whose sum is σ = 2092049284480. Its totient is φ = 1882844355996.

The previous prime is 1987446820213. The next prime is 1987446820241. The reversal of 1987446820237 is 7320286447891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987446820237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987446220237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52301232093 + ... + 52301232130.

It is an arithmetic number, because the mean of its divisors is an integer number (523012321120).

Almost surely, 2^{1987446820237} is an apocalyptic number.

It is an amenable number.

1987446820237 is a deficient number, since it is larger than the sum of its proper divisors (104602464243).

1987446820237 is a wasteful number, since it uses less digits than its factorization.

1987446820237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104602464242.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 1987446820237 in words is "one trillion, nine hundred eighty-seven billion, four hundred forty-six million, eight hundred twenty thousand, two hundred thirty-seven".