2155242400 has 36 divisors (see below), whose sum is σ = 5261487462. Its totient is φ = 862096640.

The previous prime is 2155242391. The next prime is 2155242457. The reversal of 2155242400 is 42425512.

It can be written as a sum of positive squares in 3 ways, for example, as 1337511184 + 817731216 = 36572^2 + 28596^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1346227 + ... + 1347826.

Almost surely, 2^2155242400 is an apocalyptic number.

2155242400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155242400 is an abundant number, since it is smaller than the sum of its proper divisors (3106245062).

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

2155242400 is a wasteful number, since it uses less digits than its factorization.

2155242400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694073 (or 2694060 counting only the distinct ones).

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

The square root of 2155242400 is about 46424.5883126604. The cubic root of 2155242400 is about 1291.7110479837.

Adding to 2155242400 its reverse (42425512), we get a palindrome (2197667912).

The spelling of 2155242400 in words is "two billion, one hundred fifty-five million, two hundred forty-two thousand, four hundred".