2153998620 has 36 divisors (see below), whose sum is σ = 6533796360. Its totient is φ = 574399584.

The previous prime is 2153998601. The next prime is 2153998621. The reversal of 2153998620 is 268993512.

2153998620 is a `hidden beast` number, since 2 + 1 + 539 + 98 + 6 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153998621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5983150 + ... + 5983509.

Almost surely, 2^2153998620 is an apocalyptic number.

2153998620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2153998620 is an abundant number, since it is smaller than the sum of its proper divisors (4379797740).

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

2153998620 is a wasteful number, since it uses less digits than its factorization.

2153998620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11966674 (or 11966669 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 2153998620 is about 46411.1906763875. The cubic root of 2153998620 is about 1291.4625200964.

The spelling of 2153998620 in words is "two billion, one hundred fifty-three million, nine hundred ninety-eight thousand, six hundred twenty".