155235420 has 96 divisors (see below), whose sum is σ = 487818240. Its totient is φ = 40979520.

The previous prime is 155235413. The next prime is 155235433. The reversal of 155235420 is 24532551.

It is a happy number.

155235420 is a `hidden beast` number, since 1 + 5 + 5 + 235 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 54225 + ... + 57015.

It is an arithmetic number, because the mean of its divisors is an integer number (5081440).

Almost surely, 2^155235420 is an apocalyptic number.

155235420 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 155235420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243909120).

155235420 is an abundant number, since it is smaller than the sum of its proper divisors (332582820).

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

155235420 is a wasteful number, since it uses less digits than its factorization.

155235420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 155235420 is about 12459.3507053939. The cubic root of 155235420 is about 537.4403553792.

Adding to 155235420 its reverse (24532551), we get a palindrome (179767971).

The spelling of 155235420 in words is "one hundred fifty-five million, two hundred thirty-five thousand, four hundred twenty".