155421230 has 16 divisors (see below), whose sum is σ = 280040544. Its totient is φ = 62105760.

The previous prime is 155421223. The next prime is 155421239. The reversal of 155421230 is 32124551.

It is a junction number, because it is equal to n+sod(n) for n = 155421196 and 155421205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155421239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 17940.

It is an arithmetic number, because the mean of its divisors is an integer number (17502534).

Almost surely, 2^155421230 is an apocalyptic number.

155421230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155421230 is a deficient number, since it is larger than the sum of its proper divisors (124619314).

155421230 is a wasteful number, since it uses less digits than its factorization.

155421230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15691.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 155421230 is about 12466.8051240083. The cubic root of 155421230 is about 537.6547007382.

Adding to 155421230 its reverse (32124551), we get a palindrome (187545781).

It can be divided in two parts, 15 and 5421230, that added together give a palindrome (5421245).

The spelling of 155421230 in words is "one hundred fifty-five million, four hundred twenty-one thousand, two hundred thirty".