2155030440 has 32 divisors (see below), whose sum is σ = 6465091680. Its totient is φ = 574674752.

The previous prime is 2155030433. The next prime is 2155030447. The reversal of 2155030440 is 440305512.

It is an interprime number because it is at equal distance from previous prime (2155030433) and next prime (2155030447).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2155030440.

It is not an unprimeable number, because it can be changed into a prime (2155030447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8979174 + ... + 8979413.

It is an arithmetic number, because the mean of its divisors is an integer number (202034115).

Almost surely, 2^2155030440 is an apocalyptic number.

2155030440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155030440 is an abundant number, since it is smaller than the sum of its proper divisors (4310061240).

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

2155030440 is a wasteful number, since it uses less digits than its factorization.

2155030440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17958601 (or 17958597 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2155030440 is about 46422.3054145311. The cubic root of 2155030440 is about 1291.6687016178.

Adding to 2155030440 its reverse (440305512), we get a palindrome (2595335952).

The spelling of 2155030440 in words is "two billion, one hundred fifty-five million, thirty thousand, four hundred forty".