123400020040 has 64 divisors (see below), whose sum is σ = 304069800960. Its totient is φ = 44698091520.

The previous prime is 123400020013. The next prime is 123400020061. The reversal of 123400020040 is 40020004321.

It is a junction number, because it is equal to n+sod(n) for n = 123400019996 and 123400020023.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432552 + ... + 658711.

It is an arithmetic number, because the mean of its divisors is an integer number (4751090640).

Almost surely, 2^123400020040 is an apocalyptic number.

123400020040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123400020040 is an abundant number, since it is smaller than the sum of its proper divisors (180669780920).

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

123400020040 is a wasteful number, since it uses less digits than its factorization.

123400020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091542 (or 1091538 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 123400020040 its reverse (40020004321), we get a palindrome (163420024361).

The spelling of 123400020040 in words is "one hundred twenty-three billion, four hundred million, twenty thousand, forty".