1043722640 has 80 divisors (see below), whose sum is σ = 2539645488. Its totient is φ = 398481408.

The previous prime is 1043722637. The next prime is 1043722643. The reversal of 1043722640 is 462273401.

It is an interprime number because it is at equal distance from previous prime (1043722637) and next prime (1043722643).

It can be written as a sum of positive squares in 8 ways, for example, as 1982464 + 1041740176 = 1408^2 + 32276^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1043722643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153554 + ... + 160206.

Almost surely, 2^1043722640 is an apocalyptic number.

1043722640 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 1043722640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269822744).

1043722640 is an abundant number, since it is smaller than the sum of its proper divisors (1495922848).

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

1043722640 is a wasteful number, since it uses less digits than its factorization.

1043722640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756 (or 6750 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 1043722640 is about 32306.6965194524. The cubic root of 1043722640 is about 1014.3668193710.

The spelling of 1043722640 in words is "one billion, forty-three million, seven hundred twenty-two thousand, six hundred forty".