155223000 has 128 divisors (see below), whose sum is σ = 538200000. Its totient is φ = 41385600.

The previous prime is 155222959. The next prime is 155223001. The reversal of 155223000 is 322551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155223001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24126 + ... + 29874.

Almost surely, 2^155223000 is an apocalyptic number.

155223000 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 155223000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269100000).

155223000 is an abundant number, since it is smaller than the sum of its proper divisors (382977000).

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

155223000 is a wasteful number, since it uses less digits than its factorization.

155223000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5779 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 155223000 is about 12458.8522745877. The cubic root of 155223000 is about 537.4260219080.

Adding to 155223000 its reverse (322551), we get a palindrome (155545551).

The spelling of 155223000 in words is "one hundred fifty-five million, two hundred twenty-three thousand".