155421272 has 16 divisors (see below), whose sum is σ = 295520400. Its totient is φ = 76615840.

The previous prime is 155421271. The next prime is 155421289. The reversal of 155421272 is 272124551.

It is a happy number.

It is a super-3 number, since 3×155421272³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155421271) by changing a digit.

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, 136247 + ... + 137382.

It is an arithmetic number, because the mean of its divisors is an integer number (18470025).

Almost surely, 2^155421272 is an apocalyptic number.

It is an amenable number.

155421272 is a deficient number, since it is larger than the sum of its proper divisors (140099128).

155421272 is a wasteful number, since it uses less digits than its factorization.

155421272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273706 (or 273702 counting only the distinct ones).

The product of its digits is 5600, while the sum is 29.

The square root of 155421272 is about 12466.8068084815. The cubic root of 155421272 is about 537.6547491689.

The spelling of 155421272 in words is "one hundred fifty-five million, four hundred twenty-one thousand, two hundred seventy-two".