2155405320 has 96 divisors (see below), whose sum is σ = 7010803800. Its totient is φ = 574304256.

The previous prime is 2155405319. The next prime is 2155405331. The reversal of 2155405320 is 235045512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2045029284 + 110376036 = 45222^2 + 10506^2 .

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, 829944 + ... + 832536.

Almost surely, 2^2155405320 is an apocalyptic number.

2155405320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155405320 is an abundant number, since it is smaller than the sum of its proper divisors (4855398480).

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

2155405320 is a wasteful number, since it uses less digits than its factorization.

2155405320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919 (or 4912 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2155405320 is about 46426.3429531123. The cubic root of 2155405320 is about 1291.7435950205.

The spelling of 2155405320 in words is "two billion, one hundred fifty-five million, four hundred five thousand, three hundred twenty".