155772 has 18 divisors (see below), whose sum is σ = 393848. Its totient is φ = 51912.

The previous prime is 155747. The next prime is 155773. The reversal of 155772 is 277551.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155773) by changing a digit.

155772 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2128 + ... + 2199.

2¹⁵⁵⁷⁷² is an apocalyptic number.

155772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155772 is an abundant number, since it is smaller than the sum of its proper divisors (238076).

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

155772 is a wasteful number, since it uses less digits than its factorization.

155772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337 (or 4332 counting only the distinct ones).

The product of its digits is 2450, while the sum is 27.

The square root of 155772 is about 394.6796169046. The cubic root of 155772 is about 53.8058874262.

The spelling of 155772 in words is "one hundred fifty-five thousand, seven hundred seventy-two".