123540234402 has 128 divisors (see below), whose sum is σ = 273498624000. Its totient is φ = 36970027776.

The previous prime is 123540234359. The next prime is 123540234451. The reversal of 123540234402 is 204432045321.

It is a super-2 number, since 2×123540234402² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123540234402.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 253675803 + ... + 253676289.

It is an arithmetic number, because the mean of its divisors is an integer number (2136708000).

Almost surely, 2^123540234402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123540234402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136749312000).

123540234402 is an abundant number, since it is smaller than the sum of its proper divisors (149958389598).

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

123540234402 is a wasteful number, since it uses less digits than its factorization.

123540234402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 123540234402 its reverse (204432045321), we get a palindrome (327972279723).

The spelling of 123540234402 in words is "one hundred twenty-three billion, five hundred forty million, two hundred thirty-four thousand, four hundred two".