155869805 has 32 divisors (see below), whose sum is σ = 233689344. Its totient is φ = 97168896.

The previous prime is 155869801. The next prime is 155869807. The reversal of 155869805 is 508968551.

It is a cyclic number.

It is not a de Polignac number, because 155869805 - 2² = 155869801 is a prime.

It is a super-2 number, since 2×155869805² = 48590792221476050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155869805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155869801) 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 31 ways as a sum of consecutive naturals, for example, 27929 + ... + 33041.

It is an arithmetic number, because the mean of its divisors is an integer number (7302792).

Almost surely, 2^155869805 is an apocalyptic number.

It is an amenable number.

155869805 is a deficient number, since it is larger than the sum of its proper divisors (77819539).

155869805 is a wasteful number, since it uses less digits than its factorization.

155869805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205.

The product of its (nonzero) digits is 432000, while the sum is 47.

The square root of 155869805 is about 12484.7829376405. The cubic root of 155869805 is about 538.1714615434.

The spelling of 155869805 in words is "one hundred fifty-five million, eight hundred sixty-nine thousand, eight hundred five".