2172440 has 16 divisors (see below), whose sum is σ = 4888080. Its totient is φ = 868960.

The previous prime is 2172433. The next prime is 2172461. The reversal of 2172440 is 442712.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27116 + ... + 27195.

It is an arithmetic number, because the mean of its divisors is an integer number (305505).

2^2172440 is an apocalyptic number.

2172440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2172440 is an abundant number, since it is smaller than the sum of its proper divisors (2715640).

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

2172440 is a wasteful number, since it uses less digits than its factorization.

2172440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54322 (or 54318 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2172440 is about 1473.9199435519. The cubic root of 2172440 is about 129.5137654752.

The spelling of 2172440 in words is "two million, one hundred seventy-two thousand, four hundred forty".