155212520 has 64 divisors (see below), whose sum is σ = 369316800. Its totient is φ = 58544640.

The previous prime is 155212517. The next prime is 155212559. The reversal of 155212520 is 25212551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251252 + ... + 251868.

It is an arithmetic number, because the mean of its divisors is an integer number (5770575).

Almost surely, 2^155212520 is an apocalyptic number.

155212520 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 155212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184658400).

155212520 is an abundant number, since it is smaller than the sum of its proper divisors (214104280).

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

155212520 is a wasteful number, since it uses less digits than its factorization.

155212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 155212520 is about 12458.4316830009. The cubic root of 155212520 is about 537.4139267257.

The spelling of 155212520 in words is "one hundred fifty-five million, two hundred twelve thousand, five hundred twenty".