123909903 has 12 divisors (see below), whose sum is σ = 192748920. Its totient is φ = 76252176.

The previous prime is 123909893. The next prime is 123909943. The reversal of 123909903 is 309909321.

It is not a de Polignac number, because 123909903 - 2⁵ = 123909871 is a prime.

It is a super-2 number, since 2×123909903² = 30707328122938818, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123909943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 529413 + ... + 529646.

It is an arithmetic number, because the mean of its divisors is an integer number (16062410).

Almost surely, 2^123909903 is an apocalyptic number.

123909903 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123909903 is a deficient number, since it is larger than the sum of its proper divisors (68839017).

123909903 is a wasteful number, since it uses less digits than its factorization.

123909903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059078 (or 1059075 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 123909903 is about 11131.4825158197. The cubic root of 123909903 is about 498.5422916360.

The spelling of 123909903 in words is "one hundred twenty-three million, nine hundred nine thousand, nine hundred three".