12446691840 has 480 divisors, whose sum is σ = 47792137536. Its totient is φ = 2968289280.

The previous prime is 12446691839. The next prime is 12446691877. The reversal of 12446691840 is 4819664421.

12446691840 is a `hidden beast` number, since 1 + 2 + 4 + 466 + 9 + 184 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16980114 + ... + 16980846.

Almost surely, 2^12446691840 is an apocalyptic number.

12446691840 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 12446691840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23896068768).

12446691840 is an abundant number, since it is smaller than the sum of its proper divisors (35345445696).

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

12446691840 is a wasteful number, since it uses less digits than its factorization.

12446691840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 12446691840 in words is "twelve billion, four hundred forty-six million, six hundred ninety-one thousand, eight hundred forty".