155344420 has 96 divisors (see below), whose sum is σ = 410054400. Its totient is φ = 48023040.

The previous prime is 155344411. The next prime is 155344457. The reversal of 155344420 is 24443551.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 229122 + ... + 229798.

It is an arithmetic number, because the mean of its divisors is an integer number (4271400).

Almost surely, 2^155344420 is an apocalyptic number.

155344420 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 155344420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205027200).

155344420 is an abundant number, since it is smaller than the sum of its proper divisors (254709980).

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

155344420 is a wasteful number, since it uses less digits than its factorization.

155344420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 155344420 is about 12463.7241625447. The cubic root of 155344420 is about 537.5661155375.

Adding to 155344420 its reverse (24443551), we get a palindrome (179787971).

It can be divided in two parts, 15 and 5344420, that added together give a palindrome (5344435).

The spelling of 155344420 in words is "one hundred fifty-five million, three hundred forty-four thousand, four hundred twenty".