7742138189 has 2 divisors, whose sum is σ = 7742138190. Its totient is φ = 7742138188.

The previous prime is 7742138177. The next prime is 7742138197. The reversal of 7742138189 is 9818312477.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5518261225 + 2223876964 = 74285^2 + 47158^2 .

It is an emirp because it is prime and its reverse (9818312477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7742138189 - 2²⁰ = 7741089613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7742138119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3871069094 + 3871069095.

It is an arithmetic number, because the mean of its divisors is an integer number (3871069095).

Almost surely, 2^7742138189 is an apocalyptic number.

It is an amenable number.

7742138189 is a deficient number, since it is larger than the sum of its proper divisors (1).

7742138189 is an equidigital number, since it uses as much as digits as its factorization.

7742138189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The square root of 7742138189 is about 87989.4208925141. The cubic root of 7742138189 is about 1978.2764129384.

The spelling of 7742138189 in words is "seven billion, seven hundred forty-two million, one hundred thirty-eight thousand, one hundred eighty-nine".