123816870 has 64 divisors (see below), whose sum is σ = 331200000. Its totient is φ = 32915808.

The previous prime is 123816859. The next prime is 123816881. The reversal of 123816870 is 78618321.

It is an interprime number because it is at equal distance from previous prime (123816859) and next prime (123816881).

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, 134271 + ... + 135189.

It is an arithmetic number, because the mean of its divisors is an integer number (5175000).

Almost surely, 2^123816870 is an apocalyptic number.

123816870 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 123816870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165600000).

123816870 is an abundant number, since it is smaller than the sum of its proper divisors (207383130).

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

123816870 is a wasteful number, since it uses less digits than its factorization.

123816870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 123816870 is about 11127.3029077131. The cubic root of 123816870 is about 498.4174899413.

The spelling of 123816870 in words is "one hundred twenty-three million, eight hundred sixteen thousand, eight hundred seventy".