123399890 has 16 divisors (see below), whose sum is σ = 224197632. Its totient is φ = 48898224.

The previous prime is 123399877. The next prime is 123399893. The reversal of 123399890 is 98993321.

It is not an unprimeable number, because it can be changed into a prime (123399893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56594 + ... + 58733.

It is an arithmetic number, because the mean of its divisors is an integer number (14012352).

Almost surely, 2^123399890 is an apocalyptic number.

123399890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123399890 is a deficient number, since it is larger than the sum of its proper divisors (100797742).

123399890 is a wasteful number, since it uses less digits than its factorization.

123399890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115441.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 123399890 is about 11108.5503104591. The cubic root of 123399890 is about 497.8573512282.

The spelling of 123399890 in words is "one hundred twenty-three million, three hundred ninety-nine thousand, eight hundred ninety".