1998740087 has 8 divisors (see below), whose sum is σ = 2018671200. Its totient is φ = 1978896160.

The previous prime is 1998740071. The next prime is 1998740129. The reversal of 1998740087 is 7800478991.

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

It is a cyclic number.

It is not a de Polignac number, because 1998740087 - 2⁴ = 1998740071 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 (1998740027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24773 + ... + 67905.

It is an arithmetic number, because the mean of its divisors is an integer number (252333900).

Almost surely, 2^1998740087 is an apocalyptic number.

1998740087 is a deficient number, since it is larger than the sum of its proper divisors (19931113).

1998740087 is a wasteful number, since it uses less digits than its factorization.

1998740087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43593.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 1998740087 is about 44707.2710752960. The cubic root of 1998740087 is about 1259.6564291690.

The spelling of 1998740087 in words is "one billion, nine hundred ninety-eight million, seven hundred forty thousand, eighty-seven".