155439885 has 16 divisors (see below), whose sum is σ = 248937984. Its totient is φ = 82823232.

The previous prime is 155439833. The next prime is 155439887. The reversal of 155439885 is 588934551.

It is a happy number.

It is not a de Polignac number, because 155439885 - 2⁶ = 155439821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155439887) 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 in 15 ways as a sum of consecutive naturals, for example, 13924 + ... + 22466.

It is an arithmetic number, because the mean of its divisors is an integer number (15558624).

Almost surely, 2^155439885 is an apocalyptic number.

155439885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155439885 is a deficient number, since it is larger than the sum of its proper divisors (93498099).

155439885 is a wasteful number, since it uses less digits than its factorization.

155439885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9764.

The product of its digits is 864000, while the sum is 48.

The square root of 155439885 is about 12467.5532884363. The cubic root of 155439885 is about 537.6762111997.

The spelling of 155439885 in words is "one hundred fifty-five million, four hundred thirty-nine thousand, eight hundred eighty-five".