123400620 has 216 divisors, whose sum is σ = 461601504. Its totient is φ = 26514432.

The previous prime is 123400619. The next prime is 123400643. The reversal of 123400620 is 26004321.

It is a happy number.

123400620 is a `hidden beast` number, since 1 + 2 + 3 + 40 + 0 + 620 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 123400593 and 123400602.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 149529 + ... + 150351.

It is an arithmetic number, because the mean of its divisors is an integer number (2137044).

Almost surely, 2^123400620 is an apocalyptic number.

123400620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123400620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230800752).

123400620 is an abundant number, since it is smaller than the sum of its proper divisors (338200884).

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

123400620 is a wasteful number, since it uses less digits than its factorization.

123400620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 857 counting only the distinct ones).

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

The square root of 123400620 is about 11108.5831679832. The cubic root of 123400620 is about 497.8583329556.

Adding to 123400620 its reverse (26004321), we get a palindrome (149404941).

The spelling of 123400620 in words is "one hundred twenty-three million, four hundred thousand, six hundred twenty".