2155422400 has 84 divisors (see below), whose sum is σ = 5314383072. Its totient is φ = 860431360.

The previous prime is 2155422359. The next prime is 2155422403. The reversal of 2155422400 is 42245512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (2155422403) 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, 1043769 + ... + 1045831.

Almost surely, 2^2155422400 is an apocalyptic number.

2155422400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155422400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2657191536).

2155422400 is an abundant number, since it is smaller than the sum of its proper divisors (3158960672).

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

2155422400 is a wasteful number, since it uses less digits than its factorization.

2155422400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 2155422400 is about 46426.5269000385. The cubic root of 2155422400 is about 1291.7470070504.

Adding to 2155422400 its reverse (42245512), we get a palindrome (2197667912).

The spelling of 2155422400 in words is "two billion, one hundred fifty-five million, four hundred twenty-two thousand, four hundred".