2155243400 has 24 divisors (see below), whose sum is σ = 5010941370. Its totient is φ = 862097280.

The previous prime is 2155243369. The next prime is 2155243423. The reversal of 2155243400 is 43425512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1495678276 + 659565124 = 38674^2 + 25682^2 .

It is a super-2 number, since 2×2155243400² = 9290148226487120000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2155243400.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5387909 + ... + 5388308.

Almost surely, 2^2155243400 is an apocalyptic number.

2155243400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155243400 is an abundant number, since it is smaller than the sum of its proper divisors (2855697970).

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

2155243400 is a wasteful number, since it uses less digits than its factorization.

2155243400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776233 (or 10776224 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2155243400 is about 46424.5990828138. The cubic root of 2155243400 is about 1291.7112477618.

Adding to 2155243400 its reverse (43425512), we get a palindrome (2198668912).

The spelling of 2155243400 in words is "two billion, one hundred fifty-five million, two hundred forty-three thousand, four hundred".