1889999929 has 2 divisors, whose sum is σ = 1889999930. Its totient is φ = 1889999928.

The previous prime is 1889999927. The next prime is 1890000019. The reversal of 1889999929 is 9299999881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1317690000 + 572309929 = 36300^2 + 23923^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889999929 - 2¹ = 1889999927 is a prime.

Together with 1889999927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1889999927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944999964 + 944999965.

It is an arithmetic number, because the mean of its divisors is an integer number (944999965).

Almost surely, 2^1889999929 is an apocalyptic number.

It is an amenable number.

1889999929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889999929 is an equidigital number, since it uses as much as digits as its factorization.

1889999929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68024448, while the sum is 73.

The square root of 1889999929 is about 43474.1294219907. The cubic root of 1889999929 is about 1236.3855744605.

It can be divided in two parts, 18899 and 99929, that added together give a triangular number (118828 = T₄₈₇).

The spelling of 1889999929 in words is "one billion, eight hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred twenty-nine".