653021040 has 120 divisors (see below), whose sum is σ = 2354916240. Its totient is φ = 149259264.

The previous prime is 653020993. The next prime is 653021059. The reversal of 653021040 is 40120356.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 653020998 and 653021016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16005 + ... + 39524.

It is an arithmetic number, because the mean of its divisors is an integer number (19624302).

Almost surely, 2^653021040 is an apocalyptic number.

653021040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

653021040 is an abundant number, since it is smaller than the sum of its proper divisors (1701895200).

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

653021040 is a wasteful number, since it uses less digits than its factorization.

653021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55559 (or 55546 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 653021040 is about 25554.2763544578. The cubic root of 653021040 is about 867.5790536080.

Adding to 653021040 its reverse (40120356), we get a palindrome (693141396).

The spelling of 653021040 in words is "six hundred fifty-three million, twenty-one thousand, forty".