12491940 has 96 divisors (see below), whose sum is σ = 38150784. Its totient is φ = 3041280.

The previous prime is 12491939. The next prime is 12491971. The reversal of 12491940 is 4919421.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12491898 and 12491907.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 37575 + ... + 37905.

It is an arithmetic number, because the mean of its divisors is an integer number (397404).

Almost surely, 2^12491940 is an apocalyptic number.

12491940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12491940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19075392).

12491940 is an abundant number, since it is smaller than the sum of its proper divisors (25658844).

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

12491940 is a wasteful number, since it uses less digits than its factorization.

12491940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12491940 is about 3534.3938659974. The cubic root of 12491940 is about 232.0295493476.

It can be divided in two parts, 12491 and 940, that added together give a palindrome (13431).

The spelling of 12491940 in words is "twelve million, four hundred ninety-one thousand, nine hundred forty".