2117540 has 24 divisors (see below), whose sum is σ = 4475520. Its totient is φ = 841568.

The previous prime is 2117539. The next prime is 2117561. The reversal of 2117540 is 457112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4559 + ... + 5001.

It is an arithmetic number, because the mean of its divisors is an integer number (186480).

2^2117540 is an apocalyptic number.

2117540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2117540 is an abundant number, since it is smaller than the sum of its proper divisors (2357980).

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

2117540 is a wasteful number, since it uses less digits than its factorization.

2117540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 2117540 is about 1455.1769651833. The cubic root of 2117540 is about 128.4134579567.

The spelling of 2117540 in words is "two million, one hundred seventeen thousand, five hundred forty".