1940047189 has 2 divisors, whose sum is σ = 1940047190. Its totient is φ = 1940047188.

The previous prime is 1940047169. The next prime is 1940047261. The reversal of 1940047189 is 9817400491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086823089 + 853224100 = 32967^2 + 29210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940047189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940047169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970023594 + 970023595.

It is an arithmetic number, because the mean of its divisors is an integer number (970023595).

Almost surely, 2^1940047189 is an apocalyptic number.

It is an amenable number.

1940047189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940047189 is an equidigital number, since it uses as much as digits as its factorization.

1940047189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1940047189 is about 44045.9667733608. The cubic root of 1940047189 is about 1247.2038167380.

The spelling of 1940047189 in words is "one billion, nine hundred forty million, forty-seven thousand, one hundred eighty-nine".