123231402 has 128 divisors (see below), whose sum is σ = 336199680. Its totient is φ = 32659200.

The previous prime is 123231391. The next prime is 123231403. The reversal of 123231402 is 204132321.

123231402 is a `hidden beast` number, since 1 + 232 + 31 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (123231403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 816027 + ... + 816177.

It is an arithmetic number, because the mean of its divisors is an integer number (2626560).

Almost surely, 2^123231402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123231402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168099840).

123231402 is an abundant number, since it is smaller than the sum of its proper divisors (212968278).

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

123231402 is a wasteful number, since it uses less digits than its factorization.

123231402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 123231402 is about 11100.9640121928. The cubic root of 123231402 is about 497.6306595193.

Adding to 123231402 its reverse (204132321), we get a palindrome (327363723).

The spelling of 123231402 in words is "one hundred twenty-three million, two hundred thirty-one thousand, four hundred two".