155123712 has 102 divisors (see below), whose sum is σ = 449835672. Its totient is φ = 51511296.

The previous prime is 155123701. The next prime is 155123719. The reversal of 155123712 is 217321551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155123719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589693 + ... + 589955.

Almost surely, 2^155123712 is an apocalyptic number.

155123712 is a gapful number since it is divisible by the number (12) 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 155123712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224917836).

155123712 is an abundant number, since it is smaller than the sum of its proper divisors (294711960).

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

155123712 is an frugal number, since it uses more digits than its factorization.

155123712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 268 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 155123712 is about 12454.8670004942. The cubic root of 155123712 is about 537.3114097348.

The spelling of 155123712 in words is "one hundred fifty-five million, one hundred twenty-three thousand, seven hundred twelve".