155864405 has 8 divisors (see below), whose sum is σ = 187212600. Its totient is φ = 124574656.

The previous prime is 155864389. The next prime is 155864407. The reversal of 155864405 is 504468551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20421361 + 135443044 = 4519^2 + 11638^2 .

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 155864405 - 2⁴ = 155864389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155864407) 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 7 ways as a sum of consecutive naturals, for example, 8510 + ... + 19599.

It is an arithmetic number, because the mean of its divisors is an integer number (23401575).

Almost surely, 2^155864405 is an apocalyptic number.

It is an amenable number.

155864405 is a deficient number, since it is larger than the sum of its proper divisors (31348195).

155864405 is a wasteful number, since it uses less digits than its factorization.

155864405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29223.

The product of its (nonzero) digits is 96000, while the sum is 38.

The square root of 155864405 is about 12484.5666724961. The cubic root of 155864405 is about 538.1652466141.

It can be divided in two parts, 15586 and 4405, that added together give a palindrome (19991).

The spelling of 155864405 in words is "one hundred fifty-five million, eight hundred sixty-four thousand, four hundred five".