1984655957 has 2 divisors, whose sum is σ = 1984655958. Its totient is φ = 1984655956.

The previous prime is 1984655941. The next prime is 1984655969. The reversal of 1984655957 is 7595564891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1539699121 + 444956836 = 39239^2 + 21094^2 .

It is an emirp because it is prime and its reverse (7595564891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1984655957 - 2⁴ = 1984655941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1984655896 and 1984655905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984655357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992327978 + 992327979.

It is an arithmetic number, because the mean of its divisors is an integer number (992327979).

Almost surely, 2^1984655957 is an apocalyptic number.

It is an amenable number.

1984655957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984655957 is an equidigital number, since it uses as much as digits as its factorization.

1984655957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608000, while the sum is 59.

The square root of 1984655957 is about 44549.4776288118. The cubic root of 1984655957 is about 1256.6907275947.

The spelling of 1984655957 in words is "one billion, nine hundred eighty-four million, six hundred fifty-five thousand, nine hundred fifty-seven".