155225400 has 192 divisors, whose sum is σ = 543715200. Its totient is φ = 36288000.

The previous prime is 155225381. The next prime is 155225417. The reversal of 155225400 is 4522551.

It is a happy number.

155225400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 190995 + ... + 191805.

It is an arithmetic number, because the mean of its divisors is an integer number (2831850).

Almost surely, 2^155225400 is an apocalyptic number.

155225400 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 155225400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271857600).

155225400 is an abundant number, since it is smaller than the sum of its proper divisors (388489800).

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

155225400 is a wasteful number, since it uses less digits than its factorization.

155225400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 155225400 is about 12458.9485912737. The cubic root of 155225400 is about 537.4287917205.

Adding to 155225400 its reverse (4522551), we get a palindrome (159747951).

The spelling of 155225400 in words is "one hundred fifty-five million, two hundred twenty-five thousand, four hundred".