2154312440 has 48 divisors (see below), whose sum is σ = 5638588200. Its totient is φ = 738620736.

The previous prime is 2154312379. The next prime is 2154312451. The reversal of 2154312440 is 442134512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547610 + ... + 551529.

Almost surely, 2^2154312440 is an apocalyptic number.

2154312440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154312440 is an abundant number, since it is smaller than the sum of its proper divisors (3484275760).

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

2154312440 is a wasteful number, since it uses less digits than its factorization.

2154312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099164 (or 1099153 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 2154312440 is about 46414.5714188982. The cubic root of 2154312440 is about 1291.5252355632.

Adding to 2154312440 its reverse (442134512), we get a palindrome (2596446952).

The spelling of 2154312440 in words is "two billion, one hundred fifty-four million, three hundred twelve thousand, four hundred forty".