155222140 has 12 divisors (see below), whose sum is σ = 325966536. Its totient is φ = 62088848.

The previous prime is 155222113. The next prime is 155222143. The reversal of 155222140 is 41222551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155222143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3880534 + ... + 3880573.

It is an arithmetic number, because the mean of its divisors is an integer number (27163878).

Almost surely, 2^155222140 is an apocalyptic number.

155222140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155222140 is an abundant number, since it is smaller than the sum of its proper divisors (170744396).

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

155222140 is a wasteful number, since it uses less digits than its factorization.

155222140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7761116 (or 7761114 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 155222140 is about 12458.8177609274. The cubic root of 155222140 is about 537.4250293849.

Adding to 155222140 its reverse (41222551), we get a palindrome (196444691).

The spelling of 155222140 in words is "one hundred fifty-five million, two hundred twenty-two thousand, one hundred forty".