155321140 has 36 divisors (see below), whose sum is σ = 353202444. Its totient is φ = 57348096.

The previous prime is 155321123. The next prime is 155321141. The reversal of 155321140 is 41123551.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 45239076 + 110082064 = 6726^2 + 10492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155321141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19597 + ... + 26356.

It is an arithmetic number, because the mean of its divisors is an integer number (9811179).

Almost surely, 2^155321140 is an apocalyptic number.

155321140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155321140 is an abundant number, since it is smaller than the sum of its proper divisors (197881304).

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

155321140 is a wasteful number, since it uses less digits than its factorization.

155321140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45988 (or 45973 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 155321140 is about 12462.7902172828. The cubic root of 155321140 is about 537.5392608783.

Adding to 155321140 its reverse (41123551), we get a palindrome (196444691).

The spelling of 155321140 in words is "one hundred fifty-five million, three hundred twenty-one thousand, one hundred forty".