12491478 has 24 divisors (see below), whose sum is σ = 27336816. Its totient is φ = 4122000.

The previous prime is 12491477. The next prime is 12491483. The reversal of 12491478 is 87419421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491477) 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, 1618 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (1139034).

Almost surely, 2^12491478 is an apocalyptic number.

12491478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12491478 is an abundant number, since it is smaller than the sum of its proper divisors (14845338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12491478 is a wasteful number, since it uses less digits than its factorization.

12491478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6980 (or 6977 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12491478 is about 3534.3285076518. The cubic root of 12491478 is about 232.0266888638.

The spelling of 12491478 in words is "twelve million, four hundred ninety-one thousand, four hundred seventy-eight".