155344220 has 24 divisors (see below), whose sum is σ = 326474064. Its totient is φ = 62089856.

The previous prime is 155344201. The next prime is 155344223. The reversal of 155344220 is 22443551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 155344220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155344223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36104 + ... + 40176.

It is an arithmetic number, because the mean of its divisors is an integer number (13603086).

Almost surely, 2^155344220 is an apocalyptic number.

155344220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155344220 is an abundant number, since it is smaller than the sum of its proper divisors (171129844).

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

155344220 is a wasteful number, since it uses less digits than its factorization.

155344220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5989 (or 5987 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 155344220 is about 12463.7161392580. The cubic root of 155344220 is about 537.5658848388.

Adding to 155344220 its reverse (22443551), we get a palindrome (177787771).

The spelling of 155344220 in words is "one hundred fifty-five million, three hundred forty-four thousand, two hundred twenty".