2155414440 has 64 divisors (see below), whose sum is σ = 6469594560. Its totient is φ = 574479360.

The previous prime is 2155414381. The next prime is 2155414447. The reversal of 2155414440 is 444145512.

It is a super-2 number, since 2×2155414440² = 9291622816321027200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2155414398 and 2155414407.

It is not an unprimeable number, because it can be changed into a prime (2155414447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324432 + ... + 331008.

It is an arithmetic number, because the mean of its divisors is an integer number (101087415).

Almost surely, 2^2155414440 is an apocalyptic number.

2155414440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155414440 is an abundant number, since it is smaller than the sum of its proper divisors (4314180120).

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

2155414440 is a wasteful number, since it uses less digits than its factorization.

2155414440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322 (or 9318 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 2155414440 is about 46426.4411731074. The cubic root of 2155414440 is about 1291.7454169029.

Adding to 2155414440 its reverse (444145512), we get a palindrome (2599559952).

The spelling of 2155414440 in words is "two billion, one hundred fifty-five million, four hundred fourteen thousand, four hundred forty".