12640293 has 20 divisors (see below), whose sum is σ = 19063308. Its totient is φ = 8346240.

The previous prime is 12640291. The next prime is 12640297. The reversal of 12640293 is 39204621.

12640293 is a `hidden beast` number, since 12 + 640 + 2 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2259009 + 10381284 = 1503^2 + 3222^2 .

It is not a de Polignac number, because 12640293 - 2¹ = 12640291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8463 + ... + 9843.

Almost surely, 2^12640293 is an apocalyptic number.

It is an amenable number.

12640293 is a deficient number, since it is larger than the sum of its proper divisors (6423015).

12640293 is a wasteful number, since it uses less digits than its factorization.

12640293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 12640293 is about 3555.3189730318. The cubic root of 12640293 is about 232.9444567882.

The spelling of 12640293 in words is "twelve million, six hundred forty thousand, two hundred ninety-three".