12657740 has 24 divisors (see below), whose sum is σ = 26648160. Its totient is φ = 5050368.

The previous prime is 12657739. The next prime is 12657763. The reversal of 12657740 is 4775621.

It is a junction number, because it is equal to n+sod(n) for n = 12657697 and 12657706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14969 + ... + 15791.

It is an arithmetic number, because the mean of its divisors is an integer number (1110340).

Almost surely, 2^12657740 is an apocalyptic number.

12657740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12657740 is an abundant number, since it is smaller than the sum of its proper divisors (13990420).

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

12657740 is a wasteful number, since it uses less digits than its factorization.

12657740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 12657740 is about 3557.7717745803. The cubic root of 12657740 is about 233.0515828251.

The spelling of 12657740 in words is "twelve million, six hundred fifty-seven thousand, seven hundred forty".