123402012 has 12 divisors (see below), whose sum is σ = 287938056. Its totient is φ = 41134000.

The previous prime is 123402011. The next prime is 123402023. The reversal of 123402012 is 210204321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 123401982 and 123402000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123402011) 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 3 ways as a sum of consecutive naturals, for example, 5141739 + ... + 5141762.

It is an arithmetic number, because the mean of its divisors is an integer number (23994838).

Almost surely, 2^123402012 is an apocalyptic number.

123402012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123402012 is an abundant number, since it is smaller than the sum of its proper divisors (164536044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123402012 is a wasteful number, since it uses less digits than its factorization.

123402012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283508 (or 10283506 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 123402012 is about 11108.6458220613. The cubic root of 123402012 is about 497.8602049510.

Adding to 123402012 its reverse (210204321), we get a palindrome (333606333).

The spelling of 123402012 in words is "one hundred twenty-three million, four hundred two thousand, twelve".