155121072 has 20 divisors (see below), whose sum is σ = 400729560. Its totient is φ = 51707008.

The previous prime is 155121059. The next prime is 155121079. The reversal of 155121072 is 270121551.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (155121079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1615797 + ... + 1615892.

It is an arithmetic number, because the mean of its divisors is an integer number (20036478).

Almost surely, 2^155121072 is an apocalyptic number.

155121072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155121072 is an abundant number, since it is smaller than the sum of its proper divisors (245608488).

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

155121072 is a wasteful number, since it uses less digits than its factorization.

155121072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3231700 (or 3231694 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 155121072 is about 12454.7610173781. The cubic root of 155121072 is about 537.3083616081.

The spelling of 155121072 in words is "one hundred fifty-five million, one hundred twenty-one thousand, seventy-two".