12155580 has 36 divisors (see below), whose sum is σ = 36872472. Its totient is φ = 3241440.

The previous prime is 12155579. The next prime is 12155581. The reversal of 12155580 is 8555121.

It is an interprime number because it is at equal distance from previous prime (12155579) and next prime (12155581).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×12155580³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155581) 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, 33586 + ... + 33945.

Almost surely, 2^12155580 is an apocalyptic number.

12155580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155580 is an abundant number, since it is smaller than the sum of its proper divisors (24716892).

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

12155580 is a wasteful number, since it uses less digits than its factorization.

12155580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67546 (or 67541 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 12155580 is about 3486.4853362663. The cubic root of 12155580 is about 229.9280178020.

The spelling of 12155580 in words is "twelve million, one hundred fifty-five thousand, five hundred eighty".