155784946 has 4 divisors (see below), whose sum is σ = 233677422. Its totient is φ = 77892472.

The previous prime is 155784929. The next prime is 155784947. The reversal of 155784946 is 649487551.

It is a happy number.

155784946 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 146143921 + 9641025 = 12089^2 + 3105^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 155784946.

It is not an unprimeable number, because it can be changed into a prime (155784947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38946235 + ... + 38946238.

Almost surely, 2^155784946 is an apocalyptic number.

155784946 is a deficient number, since it is larger than the sum of its proper divisors (77892476).

155784946 is an equidigital number, since it uses as much as digits as its factorization.

155784946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77892475.

The product of its digits is 1209600, while the sum is 49.

The square root of 155784946 is about 12481.3839777486. The cubic root of 155784946 is about 538.0737796303.

The spelling of 155784946 in words is "one hundred fifty-five million, seven hundred eighty-four thousand, nine hundred forty-six".