12401640 has 64 divisors (see below), whose sum is σ = 41342400. Its totient is φ = 3306816.

The previous prime is 12401593. The next prime is 12401671. The reversal of 12401640 is 4610421.

12401640 is a `hidden beast` number, since 1 + 24 + 0 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4662 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (645975).

Almost surely, 2^12401640 is an apocalyptic number.

12401640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12401640 is an abundant number, since it is smaller than the sum of its proper divisors (28940760).

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

12401640 is a wasteful number, since it uses less digits than its factorization.

12401640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11503 (or 11493 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12401640 is about 3521.5962289848. The cubic root of 12401640 is about 231.4691091050.

It can be divided in two parts, 12401 and 640, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 12401640 in words is "twelve million, four hundred one thousand, six hundred forty".