155123500 has 192 divisors, whose sum is σ = 422682624. Its totient is φ = 48576000.

The previous prime is 155123497. The next prime is 155123561. The reversal of 155123500 is 5321551.

155123500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 3300477 + ... + 3300523.

It is an arithmetic number, because the mean of its divisors is an integer number (2201472).

Almost surely, 2^155123500 is an apocalyptic number.

155123500 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 155123500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211341312).

155123500 is an abundant number, since it is smaller than the sum of its proper divisors (267559124).

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

155123500 is a wasteful number, since it uses less digits than its factorization.

155123500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 155123500 is about 12454.8584897621. The cubic root of 155123500 is about 537.3111649623.

The spelling of 155123500 in words is "one hundred fifty-five million, one hundred twenty-three thousand, five hundred".