12920787 has 12 divisors (see below), whose sum is σ = 20360184. Its totient is φ = 7830720.

The previous prime is 12920783. The next prime is 12920797. The reversal of 12920787 is 78702921.

It is not a de Polignac number, because 12920787 - 2² = 12920783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12920783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65158 + ... + 65355.

It is an arithmetic number, because the mean of its divisors is an integer number (1696682).

Almost surely, 2^12920787 is an apocalyptic number.

12920787 is a deficient number, since it is larger than the sum of its proper divisors (7439397).

12920787 is a wasteful number, since it uses less digits than its factorization.

12920787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130530 (or 130527 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 12920787 is about 3594.5496240837. The cubic root of 12920787 is about 234.6549152693.

The spelling of 12920787 in words is "twelve million, nine hundred twenty thousand, seven hundred eighty-seven".