1973947857 has 8 divisors (see below), whose sum is σ = 3007920576. Its totient is φ = 1127970192.

The previous prime is 1973947853. The next prime is 1973947873. The reversal of 1973947857 is 7587493791.

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

It is not a de Polignac number, because 1973947857 - 2² = 1973947853 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1973947857.

It is not an unprimeable number, because it can be changed into a prime (1973947853) 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, 46998738 + ... + 46998779.

It is an arithmetic number, because the mean of its divisors is an integer number (375990072).

Almost surely, 2^1973947857 is an apocalyptic number.

It is an amenable number.

1973947857 is a deficient number, since it is larger than the sum of its proper divisors (1033972719).

1973947857 is an equidigital number, since it uses as much as digits as its factorization.

1973947857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93997527.

The product of its digits is 13335840, while the sum is 60.

The square root of 1973947857 is about 44429.1329760102. The cubic root of 1973947857 is about 1254.4265157568.

The spelling of 1973947857 in words is "one billion, nine hundred seventy-three million, nine hundred forty-seven thousand, eight hundred fifty-seven".