1653021396 has 144 divisors (see below), whose sum is σ = 4629940224. Its totient is φ = 494097408.

The previous prime is 1653021389. The next prime is 1653021397. The reversal of 1653021396 is 6931203561.

1653021396 is a `hidden beast` number, since 16 + 530 + 21 + 3 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1653021396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653021397) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4904940 + ... + 4905276.

Almost surely, 2^1653021396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1653021396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314970112).

1653021396 is an abundant number, since it is smaller than the sum of its proper divisors (2976918828).

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

1653021396 is a wasteful number, since it uses less digits than its factorization.

1653021396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 1653021396 is about 40657.3658271167. The cubic root of 1653021396 is about 1182.3865793862.

The spelling of 1653021396 in words is "one billion, six hundred fifty-three million, twenty-one thousand, three hundred ninety-six".