2188155460 has 24 divisors (see below), whose sum is σ = 4743357696. Its totient is φ = 847027680.

The previous prime is 2188155451. The next prime is 2188155467. The reversal of 2188155460 is 645518812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2188155467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1764022 + ... + 1765261.

It is an arithmetic number, because the mean of its divisors is an integer number (197639904).

Almost surely, 2^2188155460 is an apocalyptic number.

2188155460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2188155460 is an abundant number, since it is smaller than the sum of its proper divisors (2555202236).

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

2188155460 is a wasteful number, since it uses less digits than its factorization.

2188155460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529323 (or 3529321 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 2188155460 is about 46777.7239719933. The cubic root of 2188155460 is about 1298.2531685981.

The spelling of 2188155460 in words is "two billion, one hundred eighty-eight million, one hundred fifty-five thousand, four hundred sixty".