12491900 has 18 divisors (see below), whose sum is σ = 27107640. Its totient is φ = 4996720.

The previous prime is 12491881. The next prime is 12491909. The reversal of 12491900 is 919421.

It is a super-2 number, since 2×12491900² = 312095131220000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12491900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62360 + ... + 62559.

It is an arithmetic number, because the mean of its divisors is an integer number (1505980).

Almost surely, 2^12491900 is an apocalyptic number.

12491900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12491900 is an abundant number, since it is smaller than the sum of its proper divisors (14615740).

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

12491900 is a wasteful number, since it uses less digits than its factorization.

12491900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124933 (or 124926 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12491900 is about 3534.3882073140. The cubic root of 12491900 is about 232.0293016894.

The spelling of 12491900 in words is "twelve million, four hundred ninety-one thousand, nine hundred".