1043400640 has 56 divisors (see below), whose sum is σ = 2489344272. Its totient is φ = 416563200.

The previous prime is 1043400587. The next prime is 1043400641. The reversal of 1043400640 is 460043401.

It is a happy number.

It is a super-3 number, since 3×1043400640³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043400641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181815 + ... + 187465.

Almost surely, 2^1043400640 is an apocalyptic number.

1043400640 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 1043400640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244672136).

1043400640 is an abundant number, since it is smaller than the sum of its proper divisors (1445943632).

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

1043400640 is an equidigital number, since it uses as much as digits as its factorization.

1043400640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245 (or 6235 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1043400640 is about 32301.7126480934. The cubic root of 1043400640 is about 1014.2624941737.

The spelling of 1043400640 in words is "one billion, forty-three million, four hundred thousand, six hundred forty".