12400491 has 16 divisors (see below), whose sum is σ = 17061408. Its totient is φ = 8006400.

The previous prime is 12400489. The next prime is 12400511. The reversal of 12400491 is 19400421.

It is not a de Polignac number, because 12400491 - 2¹ = 12400489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12400441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21985 + ... + 22541.

It is an arithmetic number, because the mean of its divisors is an integer number (1066338).

Almost surely, 2^12400491 is an apocalyptic number.

12400491 is a deficient number, since it is larger than the sum of its proper divisors (4660917).

12400491 is a wasteful number, since it uses less digits than its factorization.

12400491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12400491 is about 3521.4330889568. The cubic root of 12400491 is about 231.4619604209.

The spelling of 12400491 in words is "twelve million, four hundred thousand, four hundred ninety-one".