155390550 has 96 divisors (see below), whose sum is σ = 463660800. Its totient is φ = 33644160.

The previous prime is 155390549. The next prime is 155390563. The reversal of 155390550 is 55093551.

It is a Curzon number.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 16056 + ... + 23844.

It is an arithmetic number, because the mean of its divisors is an integer number (4829800).

Almost surely, 2^155390550 is an apocalyptic number.

155390550 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 155390550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231830400).

155390550 is an abundant number, since it is smaller than the sum of its proper divisors (308270250).

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

155390550 is a wasteful number, since it uses less digits than its factorization.

155390550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7830 (or 7825 counting only the distinct ones).

The product of its (nonzero) digits is 16875, while the sum is 33.

The square root of 155390550 is about 12465.5745956614. The cubic root of 155390550 is about 537.6193209047.

The spelling of 155390550 in words is "one hundred fifty-five million, three hundred ninety thousand, five hundred fifty".