123992989 has 2 divisors, whose sum is σ = 123992990. Its totient is φ = 123992988.

The previous prime is 123992971. The next prime is 123993011. The reversal of 123992989 is 989299321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102212100 + 21780889 = 10110^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 123992989 - 2⁷ = 123992861 is a prime.

It is a super-2 number, since 2×123992989² = 30748522642308242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123992189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61996494 + 61996495.

It is an arithmetic number, because the mean of its divisors is an integer number (61996495).

Almost surely, 2^123992989 is an apocalyptic number.

It is an amenable number.

123992989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123992989 is an equidigital number, since it uses as much as digits as its factorization.

123992989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 52.

The square root of 123992989 is about 11135.2139180170. The cubic root of 123992989 is about 498.6536968560.

The spelling of 123992989 in words is "one hundred twenty-three million, nine hundred ninety-two thousand, nine hundred eighty-nine".