1998405827 has 8 divisors (see below), whose sum is σ = 2189601840. Its totient is φ = 1808796960.

The previous prime is 1998405823. The next prime is 1998405839. The reversal of 1998405827 is 7285048991.

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 1998405827 - 2² = 1998405823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998405821) 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, 394148 + ... + 399185.

It is an arithmetic number, because the mean of its divisors is an integer number (273700230).

Almost surely, 2^1998405827 is an apocalyptic number.

1998405827 is a deficient number, since it is larger than the sum of its proper divisors (191196013).

1998405827 is a wasteful number, since it uses less digits than its factorization.

1998405827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793573.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The square root of 1998405827 is about 44703.5326009030. The cubic root of 1998405827 is about 1259.5862055592.

The spelling of 1998405827 in words is "one billion, nine hundred ninety-eight million, four hundred five thousand, eight hundred twenty-seven".