1997765998 has 8 divisors (see below), whose sum is σ = 3001240008. Its totient is φ = 997352664.

The previous prime is 1997765989. The next prime is 1997766013. The reversal of 1997765998 is 8995677991.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763536 + ... + 766147.

It is an arithmetic number, because the mean of its divisors is an integer number (375155001).

Almost surely, 2^1997765998 is an apocalyptic number.

1997765998 is a deficient number, since it is larger than the sum of its proper divisors (1003474010).

1997765998 is a wasteful number, since it uses less digits than its factorization.

1997765998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530338.

The product of its digits is 77157360, while the sum is 70.

The square root of 1997765998 is about 44696.3756696223. The cubic root of 1997765998 is about 1259.4517640964.

The spelling of 1997765998 in words is "one billion, nine hundred ninety-seven million, seven hundred sixty-five thousand, nine hundred ninety-eight".