2154440 has 16 divisors (see below), whose sum is σ = 4847580. Its totient is φ = 861760.

The previous prime is 2154419. The next prime is 2154487. The reversal of 2154440 is 444512.

2154440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2079364 + 75076 = 1442^2 + 274^2 .

It is a super-2 number, since 2×2154440² = 9283223427200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26891 + ... + 26970.

2^2154440 is an apocalyptic number.

2154440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154440 is an abundant number, since it is smaller than the sum of its proper divisors (2693140).

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

2154440 is a wasteful number, since it uses less digits than its factorization.

2154440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53872 (or 53868 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2154440 is about 1467.8010764405. The cubic root of 2154440 is about 129.1550726095.

Adding to 2154440 its reverse (444512), we get a palindrome (2598952).

The spelling of 2154440 in words is "two million, one hundred fifty-four thousand, four hundred forty".