155229439 has 4 divisors (see below), whose sum is σ = 156973680. Its totient is φ = 153485200.

The previous prime is 155229379. The next prime is 155229443. The reversal of 155229439 is 934922551.

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

It is a cyclic number.

It is not a de Polignac number, because 155229439 - 2²⁵ = 121675007 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155229479) 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, 871987 + ... + 872164.

It is an arithmetic number, because the mean of its divisors is an integer number (39243420).

Almost surely, 2^155229439 is an apocalyptic number.

155229439 is a deficient number, since it is larger than the sum of its proper divisors (1744241).

155229439 is an equidigital number, since it uses as much as digits as its factorization.

155229439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744240.

The product of its digits is 97200, while the sum is 40.

The square root of 155229439 is about 12459.1106825487. The cubic root of 155229439 is about 537.4334530196.

The spelling of 155229439 in words is "one hundred fifty-five million, two hundred twenty-nine thousand, four hundred thirty-nine".