155405212 has 12 divisors (see below), whose sum is σ = 273785400. Its totient is φ = 77180816.

The previous prime is 155405207. The next prime is 155405213. The reversal of 155405212 is 212504551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155405213) 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 3 ways as a sum of consecutive naturals, for example, 129778 + ... + 130969.

It is an arithmetic number, because the mean of its divisors is an integer number (22815450).

Almost surely, 2^155405212 is an apocalyptic number.

It is an amenable number.

155405212 is a deficient number, since it is larger than the sum of its proper divisors (118380188).

155405212 is a wasteful number, since it uses less digits than its factorization.

155405212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260900 (or 260898 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 155405212 is about 12466.1626814349. The cubic root of 155405212 is about 537.6362295403.

Adding to 155405212 its reverse (212504551), we get a palindrome (367909763).

The spelling of 155405212 in words is "one hundred fifty-five million, four hundred five thousand, two hundred twelve".