155321232 has 40 divisors (see below), whose sum is σ = 437724960. Its totient is φ = 47066880.

The previous prime is 155321213. The next prime is 155321239. The reversal of 155321232 is 232123551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (155321239) 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, 146557 + ... + 147612.

It is an arithmetic number, because the mean of its divisors is an integer number (10943124).

Almost surely, 2^155321232 is an apocalyptic number.

155321232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155321232 is an abundant number, since it is smaller than the sum of its proper divisors (282403728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155321232 is a wasteful number, since it uses less digits than its factorization.

155321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294191 (or 294185 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 155321232 is about 12462.7939082695. The cubic root of 155321232 is about 537.5393670103.

Adding to 155321232 its reverse (232123551), we get a palindrome (387444783).

The spelling of 155321232 in words is "one hundred fifty-five million, three hundred twenty-one thousand, two hundred thirty-two".