12990555 has 12 divisors (see below), whose sum is σ = 22517040. Its totient is φ = 6928272.

The previous prime is 12990553. The next prime is 12990557. The reversal of 12990555 is 55509921.

12990555 is a `hidden beast` number, since 12 + 9 + 90 + 555 = 666.

12990555 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12990553) and next prime (12990557).

It is not a de Polignac number, because 12990555 - 2¹ = 12990553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12990553) 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, 144295 + ... + 144384.

It is an arithmetic number, because the mean of its divisors is an integer number (1876420).

Almost surely, 2^12990555 is an apocalyptic number.

12990555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12990555 is a deficient number, since it is larger than the sum of its proper divisors (9526485).

12990555 is a wasteful number, since it uses less digits than its factorization.

12990555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288690 (or 288687 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 12990555 is about 3604.2412516367. The cubic root of 12990555 is about 235.0765104728.

The spelling of 12990555 in words is "twelve million, nine hundred ninety thousand, five hundred fifty-five".