127783993 has 2 divisors, whose sum is σ = 127783994. Its totient is φ = 127783992.

The previous prime is 127783973. The next prime is 127784011. The reversal of 127783993 is 399387721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84052224 + 43731769 = 9168^2 + 6613^2 .

It is an emirp because it is prime and its reverse (399387721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127783993 - 2¹³ = 127775801 is a prime.

It is not a weakly prime, because it can be changed into another prime (127783913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63891996 + 63891997.

It is an arithmetic number, because the mean of its divisors is an integer number (63891997).

Almost surely, 2^127783993 is an apocalyptic number.

It is an amenable number.

127783993 is a deficient number, since it is larger than the sum of its proper divisors (1).

127783993 is an equidigital number, since it uses as much as digits as its factorization.

127783993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 127783993 is about 11304.1582172225. The cubic root of 127783993 is about 503.6847689160.

The spelling of 127783993 in words is "one hundred twenty-seven million, seven hundred eighty-three thousand, nine hundred ninety-three".