1878888989 has 2 divisors, whose sum is σ = 1878888990. Its totient is φ = 1878888988.

The previous prime is 1878888931. The next prime is 1878889003. The reversal of 1878888989 is 9898888781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1545826489 + 333062500 = 39317^2 + 18250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1878888989 - 2⁸ = 1878888733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1878888289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 939444494 + 939444495.

It is an arithmetic number, because the mean of its divisors is an integer number (939444495).

Almost surely, 2^1878888989 is an apocalyptic number.

It is an amenable number.

1878888989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1878888989 is an equidigital number, since it uses as much as digits as its factorization.

1878888989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148635648, while the sum is 74.

The square root of 1878888989 is about 43346.1531049758. The cubic root of 1878888989 is about 1233.9579881185.

The spelling of 1878888989 in words is "one billion, eight hundred seventy-eight million, eight hundred eighty-eight thousand, nine hundred eighty-nine".