123540870 has 64 divisors (see below), whose sum is σ = 324803520. Its totient is φ = 29933568.

The previous prime is 123540829. The next prime is 123540881. The reversal of 123540870 is 78045321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10614 + ... + 18966.

It is an arithmetic number, because the mean of its divisors is an integer number (5075055).

Almost surely, 2^123540870 is an apocalyptic number.

123540870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123540870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162401760).

123540870 is an abundant number, since it is smaller than the sum of its proper divisors (201262650).

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

123540870 is a wasteful number, since it uses less digits than its factorization.

123540870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 123540870 is about 11114.8940615734. The cubic root of 123540870 is about 498.0468738641.

The spelling of 123540870 in words is "one hundred twenty-three million, five hundred forty thousand, eight hundred seventy".