1998770395 has 16 divisors (see below), whose sum is σ = 2423655360. Its totient is φ = 1582349184.

The previous prime is 1998770383. The next prime is 1998770399. The reversal of 1998770395 is 5930778991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1998770395 - 2¹¹ = 1998768347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998770399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185989 + ... + 196441.

It is an arithmetic number, because the mean of its divisors is an integer number (151478460).

Almost surely, 2^1998770395 is an apocalyptic number.

1998770395 is a deficient number, since it is larger than the sum of its proper divisors (424884965).

1998770395 is a wasteful number, since it uses less digits than its factorization.

1998770395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10854.

The product of its (nonzero) digits is 4286520, while the sum is 58.

The square root of 1998770395 is about 44707.6100345344. The cubic root of 1998770395 is about 1259.6627960922.

The spelling of 1998770395 in words is "one billion, nine hundred ninety-eight million, seven hundred seventy thousand, three hundred ninety-five".