155438212 has 12 divisors (see below), whose sum is σ = 277804800. Its totient is φ = 76065416.

The previous prime is 155438203. The next prime is 155438237. The reversal of 155438212 is 212834551.

It is a super-2 number, since 2×155438212² = 48322075499513888, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 413212 + ... + 413587.

It is an arithmetic number, because the mean of its divisors is an integer number (23150400).

Almost surely, 2^155438212 is an apocalyptic number.

It is an amenable number.

155438212 is a deficient number, since it is larger than the sum of its proper divisors (122366588).

155438212 is a wasteful number, since it uses less digits than its factorization.

155438212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826850 (or 826848 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 155438212 is about 12467.4861940970. The cubic root of 155438212 is about 537.6742821892.

The spelling of 155438212 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred twelve".