12920090 has 8 divisors (see below), whose sum is σ = 23256180. Its totient is φ = 5168032.

The previous prime is 12920071. The next prime is 12920093. The reversal of 12920090 is 9002921.

It can be written as a sum of positive squares in 2 ways, for example, as 12737761 + 182329 = 3569^2 + 427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12920093) 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, 645995 + ... + 646014.

Almost surely, 2^12920090 is an apocalyptic number.

12920090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12920090 is a deficient number, since it is larger than the sum of its proper divisors (10336090).

12920090 is a wasteful number, since it uses less digits than its factorization.

12920090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292016.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 12920090 is about 3594.4526704354. The cubic root of 12920090 is about 234.6506957788.

The spelling of 12920090 in words is "twelve million, nine hundred twenty thousand, ninety".