155749772 has 12 divisors (see below), whose sum is σ = 273156576. Its totient is φ = 77705040.

The previous prime is 155749771. The next prime is 155749817. The reversal of 155749772 is 277947551.

155749772 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (155749771) 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, 40388 + ... + 44075.

It is an arithmetic number, because the mean of its divisors is an integer number (22763048).

Almost surely, 2^155749772 is an apocalyptic number.

It is an amenable number.

155749772 is a deficient number, since it is larger than the sum of its proper divisors (117406804).

155749772 is a wasteful number, since it uses less digits than its factorization.

155749772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84928 (or 84926 counting only the distinct ones).

The product of its digits is 617400, while the sum is 47.

The square root of 155749772 is about 12479.9748397182. The cubic root of 155749772 is about 538.0332801421.

The spelling of 155749772 in words is "one hundred fifty-five million, seven hundred forty-nine thousand, seven hundred seventy-two".