1978968998 has 8 divisors (see below), whose sum is σ = 2973250920. Its totient is φ = 987885360.

The previous prime is 1978968947. The next prime is 1978969033. The reversal of 1978968998 is 8998698791.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798023 + ... + 800498.

It is an arithmetic number, because the mean of its divisors is an integer number (371656365).

Almost surely, 2^1978968998 is an apocalyptic number.

1978968998 is a deficient number, since it is larger than the sum of its proper divisors (994281922).

1978968998 is a wasteful number, since it uses less digits than its factorization.

1978968998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599142.

The product of its digits is 141087744, while the sum is 74.

The square root of 1978968998 is about 44485.6043906341. The cubic root of 1978968998 is about 1255.4892455015.

The spelling of 1978968998 in words is "one billion, nine hundred seventy-eight million, nine hundred sixty-eight thousand, nine hundred ninety-eight".