2154140140 has 24 divisors (see below), whose sum is σ = 4536524160. Its totient is φ = 859212288.

The previous prime is 2154140063. The next prime is 2154140147. The reversal of 2154140140 is 410414512.

It is not an unprimeable number, because it can be changed into a prime (2154140147) 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, 145500 + ... + 159619.

It is an arithmetic number, because the mean of its divisors is an integer number (189021840).

Almost surely, 2^2154140140 is an apocalyptic number.

2154140140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154140140 is an abundant number, since it is smaller than the sum of its proper divisors (2382384020).

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

2154140140 is a wasteful number, since it uses less digits than its factorization.

2154140140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305481 (or 305479 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2154140140 is about 46412.7152836375. The cubic root of 2154140140 is about 1291.4908029640.

Adding to 2154140140 its reverse (410414512), we get a palindrome (2564554652).

The spelling of 2154140140 in words is "two billion, one hundred fifty-four million, one hundred forty thousand, one hundred forty".