155727949 has 8 divisors (see below), whose sum is σ = 168130872. Its totient is φ = 143385600.

The previous prime is 155727947. The next prime is 155727959. The reversal of 155727949 is 949727551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85470025 + 70257924 = 9245^2 + 8382^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155727949 - 2¹ = 155727947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155727947) 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 7 ways as a sum of consecutive naturals, for example, 9724 + ... + 20149.

It is an arithmetic number, because the mean of its divisors is an integer number (21016359).

Almost surely, 2^155727949 is an apocalyptic number.

It is an amenable number.

155727949 is a deficient number, since it is larger than the sum of its proper divisors (12402923).

155727949 is a wasteful number, since it uses less digits than its factorization.

155727949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30287.

The product of its digits is 793800, while the sum is 49.

The square root of 155727949 is about 12479.1004884166. The cubic root of 155727949 is about 538.0081499850.

The spelling of 155727949 in words is "one hundred fifty-five million, seven hundred twenty-seven thousand, nine hundred forty-nine".