1246706640 has 140 divisors (see below), whose sum is σ = 4346104644. Its totient is φ = 332439552.

The previous prime is 1246706627. The next prime is 1246706687. The reversal of 1246706640 is 466076421.

1246706640 is a `hidden beast` number, since 1 + 2 + 4 + 6 + 7 + 0 + 6 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 238517136 + 1008189504 = 15444^2 + 31752^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1246706595 and 1246706604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 47632 + ... + 69008.

Almost surely, 2^1246706640 is an apocalyptic number.

1246706640 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 1246706640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2173052322).

1246706640 is an abundant number, since it is smaller than the sum of its proper divisors (3099398004).

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

1246706640 is an equidigital number, since it uses as much as digits as its factorization.

1246706640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21408 (or 21387 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1246706640 is about 35308.7331973267. The cubic root of 1246706640 is about 1076.2704690834.

The spelling of 1246706640 in words is "one billion, two hundred forty-six million, seven hundred six thousand, six hundred forty".