1997942893 has 8 divisors (see below), whose sum is σ = 2012843520. Its totient is φ = 1983098160.

The previous prime is 1997942887. The next prime is 1997942897. The reversal of 1997942893 is 3982497991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997942893 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 (1997942897) 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, 59196 + ... + 86602.

It is an arithmetic number, because the mean of its divisors is an integer number (251605440).

Almost surely, 2^1997942893 is an apocalyptic number.

It is an amenable number.

1997942893 is a deficient number, since it is larger than the sum of its proper divisors (14900627).

1997942893 is a wasteful number, since it uses less digits than its factorization.

1997942893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27947.

The product of its digits is 8817984, while the sum is 61.

The square root of 1997942893 is about 44698.3544775420. The cubic root of 1997942893 is about 1259.4889363085.

The spelling of 1997942893 in words is "one billion, nine hundred ninety-seven million, nine hundred forty-two thousand, eight hundred ninety-three".