155432405 has 4 divisors (see below), whose sum is σ = 186518892. Its totient is φ = 124345920.

The previous prime is 155432383. The next prime is 155432437. The reversal of 155432405 is 504234551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 102535876 + 52896529 = 10126^2 + 7273^2 .

It is not a de Polignac number, because 155432405 - 2¹⁸ = 155170261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15543236 + ... + 15543245.

It is an arithmetic number, because the mean of its divisors is an integer number (46629723).

Almost surely, 2^155432405 is an apocalyptic number.

It is an amenable number.

155432405 is a deficient number, since it is larger than the sum of its proper divisors (31086487).

155432405 is an equidigital number, since it uses as much as digits as its factorization.

155432405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31086486.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 155432405 is about 12467.2533061617. The cubic root of 155432405 is about 537.6675864666.

Adding to 155432405 its reverse (504234551), we get a palindrome (659666956).

The spelling of 155432405 in words is "one hundred fifty-five million, four hundred thirty-two thousand, four hundred five".