1653040840 has 64 divisors (see below), whose sum is σ = 4093493760. Its totient is φ = 595768320.

The previous prime is 1653040813. The next prime is 1653040847. The reversal of 1653040840 is 480403561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1653040847) 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, 33097 + ... + 66343.

It is an arithmetic number, because the mean of its divisors is an integer number (63960840).

Almost surely, 2^1653040840 is an apocalyptic number.

1653040840 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 1653040840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2046746880).

1653040840 is an abundant number, since it is smaller than the sum of its proper divisors (2440452920).

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

1653040840 is a wasteful number, since it uses less digits than its factorization.

1653040840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382 (or 33378 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1653040840 is about 40657.6049466763. The cubic root of 1653040840 is about 1182.3912153888.

The spelling of 1653040840 in words is "one billion, six hundred fifty-three million, forty thousand, eight hundred forty".