1240874640 has 140 divisors (see below), whose sum is σ = 4325774844. Its totient is φ = 330884352.

The previous prime is 1240874617. The next prime is 1240874669. The reversal of 1240874640 is 464780421.

1240874640 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 8 + 7 + 4 + 640 = 666.

1240874640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 218921616 + 1021953024 = 14796^2 + 31968^2 .

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 = 1240874595 and 1240874604.

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, 47682 + ... + 68958.

Almost surely, 2^1240874640 is an apocalyptic number.

1240874640 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 1240874640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162887422).

1240874640 is an abundant number, since it is smaller than the sum of its proper divisors (3084900204).

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

1240874640 is an equidigital number, since it uses as much as digits as its factorization.

1240874640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21308 (or 21287 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 1240874640 is about 35226.0505875978. The cubic root of 1240874640 is about 1074.5896079060.

The spelling of 1240874640 in words is "one billion, two hundred forty million, eight hundred seventy-four thousand, six hundred forty".