123609402 has 80 divisors (see below), whose sum is σ = 333263040. Its totient is φ = 33452352.

The previous prime is 123609401. The next prime is 123609413. The reversal of 123609402 is 204906321.

123609402 is a `hidden beast` number, since 12 + 3 + 609 + 40 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (123609401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18678 + ... + 24414.

It is an arithmetic number, because the mean of its divisors is an integer number (4165788).

Almost surely, 2^123609402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123609402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166631520).

123609402 is an abundant number, since it is smaller than the sum of its proper divisors (209653638).

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

123609402 is a wasteful number, since it uses less digits than its factorization.

123609402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5777 (or 5768 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 123609402 is about 11117.9765245300. The cubic root of 123609402 is about 498.1389509203.

The spelling of 123609402 in words is "one hundred twenty-three million, six hundred nine thousand, four hundred two".