123653989 has 2 divisors, whose sum is σ = 123653990. Its totient is φ = 123653988.

The previous prime is 123653977. The next prime is 123654001. The reversal of 123653989 is 989356321.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (123653977) and next prime (123654001).

It can be written as a sum of positive squares in only one way, i.e., 117353889 + 6300100 = 10833^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 123653989 - 2¹⁹ = 123129701 is a prime.

It is a super-2 number, since 2×123653989² = 30580617991224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123653969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61826994 + 61826995.

It is an arithmetic number, because the mean of its divisors is an integer number (61826995).

Almost surely, 2^123653989 is an apocalyptic number.

It is an amenable number.

123653989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123653989 is an equidigital number, since it uses as much as digits as its factorization.

123653989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 123653989 is about 11119.9815197688. The cubic root of 123653989 is about 498.1988380893.

It can be divided in two parts, 1236 and 53989, that added together give a square (55225 = 235²).

The spelling of 123653989 in words is "one hundred twenty-three million, six hundred fifty-three thousand, nine hundred eighty-nine".