1940017657 has 2 divisors, whose sum is σ = 1940017658. Its totient is φ = 1940017656.

The previous prime is 1940017621. The next prime is 1940017661. The reversal of 1940017657 is 7567100491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931514601 + 8503056 = 43949^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940017657 - 2²⁷ = 1805799929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1940017357) 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, 970008828 + 970008829.

It is an arithmetic number, because the mean of its divisors is an integer number (970008829).

Almost surely, 2^1940017657 is an apocalyptic number.

It is an amenable number.

1940017657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940017657 is an equidigital number, since it uses as much as digits as its factorization.

1940017657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 1940017657 is about 44045.6315314016. The cubic root of 1940017657 is about 1247.1974882648.

The spelling of 1940017657 in words is "one billion, nine hundred forty million, seventeen thousand, six hundred fifty-seven".